Considering your situation I would just get the quad core 955, from what I hear it OC's pretty well, better than the 945. It sounds like you have a nice upgrade path laid out as well. I would say spend as much as you can on your mobo now, if an extra $20-30 gets you a much nicer board, just do it.
I'm not too familar with current gen AMD boards, the last one I used was a Gigabyte GA-MA770T-UD3P, which I rather liked. I was able to get a phenom II x2 550 BE up to 4.0 Ghz on air cooling, and 3.8 ghz with 2 cores unlocked running as a x4. I got it as a bundle back for $140 back in 2009, and sold it for $120 in 2010, so I got my moneys worth out of it too.
You probably can't go wrong with either a Asus, or Gigabyte 9xx series board, and should be able to do what you want with it. I don't like recommending by brand name solely, so I'm not going to recommend you a board. I'm sure somebody else will. That ASRock a few posts back is probably fine, I've heard good things about them recently. I'm considering a ASRock for a SB build. It's too bad there isn't a microcenter near NC, i'd try to sell you on a budget Intel build (i5 2500k + p67 < $280 OTD)