I am looking to convert my Norco Threshold to a single chain ring in the front, rather than a double. I never really liked front derailleurs, and they never liked me.
The bike is rocking a FSA MegaExo BB-4000. The place that I work sells Sram Apex-1 Cranksets, If I were to buy one would I buy the GXP or BB30 Interface? Also are apex-1's a good choice for this bike? I only use it to commute to work and weekend rides. Also what do you think of the current FSA Omega Cross crankset on the bike? I personally dont really like the look of it. It looks kind of cheapish to me.
Thanks!

Apex is a good choice, you will need the GXP model and it should come with the BB (GXP cranks usually do).

While not the OP's question I wonder what his coworkers suggested. "The place that I work sells Sram Apex-1 Cranksets,". Andy

I haven't asked anyone from my work. Are you saying this because you think this is a bad choice or rather I should run this by someone from my work?

Hey, another thing I forgot to mention: my cassette is a 11-32t 10 spd. Will converting to a single 42t front chainring be bad for the gear ranges? Obviously it will drop half my gears, but what i'm wondering is how is a 42 x 11-32 gear ratios? Will that be sufficient or will it be really restricting?
Also does my shimano tiagra rear derailleur have clutch? if not with this be a problem for a one by conversion?

Single ring Cyclocross ia old stuff.. with a chain guard on either side of a single chainring
the course has to be super rough before the chain will jump off over either chain-guard-ring.

its Math, know any Math?

42-32 is 34.5 gear inches, enough for everything but really long climbs. Heck, i've got 36-25 as the low on one bike, which is 37.9 gear inches-- maintaining any climbing cadence in that gear gets tiresome after awhile. My 1X bike has an 11-42 cassette, but I spend most climbs in the 42-32. For commuting, you should be just fine.

Sorry if my reference was too oblique. I assumed that you worked at a place that sells bike parts (usually called a bike shop). I assumed that if you had a bike part question and that you, both, worked at a shop and since you were asking the open world you either didn't have a set opinion or maybe what you should do. It just seem natural to me, given my assumptions, that you'd first ask your bike shop coworkers for their views before going to the trouble of posting to the world. My bad. Andy

Save yourself some money and use your original chainset. Either drop a ring and throw a set of single chainring bolts on there or keep the double ring bolts and pick up a bash guard for it.

It has one of those new proprietary FSA cranks, with 4-bolt 120/90BCD-- it will be tough to find a narrow wide ring for it. Better to just buy a dedicated 1X crankset and sell the Omega Cross to help offset the cost. I mean, in American money (not sure about Canada) the Apex 1 with a 42T X-Sync ring is only about a hundred bucks.

Check the BCD of your crank, if it's 110 5 bolt it's really easy to get a new narrow/wide ring for it, which will save you a good bit of cash and work as well as a new crank.

If you want to change the crank anyways Apex 1 is fine. You'll need GXP with a new GXP BB to go with it.

Your derailleur does not have a clutch. Lots of riders have good results with a narrow wide and a road derailleur, but depending on conditions you may need additional chain retention. A 42 with an 11-32 is pretty common 1x cross race gearing, but will be pretty rough for steeper for sustained road climbs, and bordering on unrideable for a lot of offroad uphill. That derailleur officially supports up to a 34t, and probably will shift a 11-36 pretty OK. If you want a wider range and/or a clutch you pretty much need to go with a full SRAM 1x drivetrain.

How would we know that? Here's a novel idea - Unless there's a pressing need to change to 1x right now just ride only the 42 tooth for a while and see if it restricts you. Frankly, I don't see the attraction of losing a chainwheel. It's hard to believe that a front derailleur would be very problematic on a bike in that price range, and what you gain in simplicity you lose in extra wear, as you will be riding the small cogs more than before and wearing a single chainring instead of two.

Ah, sorry for that. I wasn't aware of the pattern and the difficulty matching up the rings if need. Good luck with your find and build.