don't pedal backwards...
Join Date: Jul 2005
Bikes: Surly Long Haul Trucker set up for commuting and loaded touring, old Sekine road frame converted to fixed-gear, various beaters and weird bikes, waiting on the frame for my Surly Big Dummy build
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What Grunk said.
Don't bother with a used rim unless you know that it's mint. A bent or otherwise screwy wheel (like broken spokes is a sign of) is just a recipe for a nightmare. Paying $35 for a brand new rim is cheap insurance against insanity. Some bike shops won't reuse your old rims when building wheels for these reasons.
What size tire are you going to be using on this wheel? You should (roughly) match up the tire and rim for compatability. I don't know what the rule of thumb is, but check with the bike shop to make sure that whatever rim you end up using isn't too narrow or wide for the tire you have in mind.
As for hole count, all you really need to do is match the count between the rim and the hub, and then get that many spokes (of the right length). If you're having a shop do the actual build, they can tell you what will and won't work.
+1 on the three-cross spoke pattern recommendation, too.
If in doubt on the axle width, just grab a ruler and measure the distance between the inside faces of the rear dropouts. If you don't have a metric ruler, 130mm is between 5" and 5-1/8". mm / 25.4 = inches
I run RD cranks and like them a lot. Some people will try to tell you that they feel flexy, but I can't tell. I doubt you nor I race on the track or anything, so they should work great for you. Shimano's cartridge BBs are pretty bulletproof and pretty cheap when compared to something like a Phil Wood BB.
Good luck on the build, and keep us posted.