topslop1

Wheelset that's $300-$350 dollar range, will take a 200lbs body on them, made for 28mm tires, so wider rims, and lighter in weight (1500-1600g, am i dreaming), although I know at that point I'm asking a lot for the price point.

Closest contenders?

Currently on RS10's: Next question being, is it a worthwhile upgrade?

bikemig 

You should be able to find a wheelset with shimano 105 hubs and mavic open sport rims for around your budget from Quality Bike Products; these are well made wheels,

Quality Wheels Rear Road Rim Brake 700c 36h 105 5800 11-speed / Mavic Open Sport / DT Competition / DT Alloy All Black - Modern Bike

Velocity sport road wheelset (these are well made wheels) with choice of rims also for $300

Velocity Wheels - Hand Made in USA

Velomine is also a good source for inexpensive wheels,

H + plus Son TB14 Polished Silver - Shimano 5800 105 - DT Champ [0072774740895] - $199.00 Velomine.com : Worldwide Bicycle Shop, fixed gear track bike wheelsets campagnolo super record vintage bike

These are nice wheels at $200 plus shipping.

Sy Reene

You could consider some Fulcrum 5 LGs -- regular or the CX version (if you see value in the hubs being a bit more sealed). Not quite at your listed weight restriction, but not too far away.
Fulcrum Racing 5 LG CX Wheelset 2016 | Chain Reaction Cycles

Carbonfiberboy 

For high end alu wheels at that price point and weight, build your own! Bikehubstore has what you'll need. I've used up my current best wheelset so that's what I'll do for this summer's big rides. Alu race level wheels for half the money.

chaadster

The Cosine Alloy wheelset from Wiggle is a 21.5mm outside width, 32mm deep aero, 1485g, 11spd tubeless wheelset at $332.

Homebrew01

You don't need special rims for 28mm tires.

chaadster

True, but wider rims will make those 28s handle and feel better; more responsive and precise.

dtrain

I'd run those rs10's awhile longer if they aren't giving you trouble. A wider rim might feel a touch better...but you'd need to spend a bit more to achieve that weight and feel a difference (especially with your size - can't be a Vuelta SLR or similar).

Homebrew01

Meh, I doubt anyone can tell the difference. I can barely feel much difference between 25 and 28 tires, let alone rim widths.

chaadster

I dunno about that...I can discern a difference between running 30s on standard width Mavics and on 18.1mm internal AC rims, to the point where I would rather waste a pair of latex tubes and buy a new pair of the same tire in a smaller size than run the 30s on the Mavics.

I'm sure a lot of it is to do with rider weight, tire pressure, road conditions, and riding style. I'm speaking from my experience as a heavy, aggressive rider trying to run lower PSI on poor pavement and dirt roads.