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Don't buy premade products, theyre pretty useless for the price you have to pay. A $75 home made bass trap will out-perform $200 (or more) foam trap kits. Also, buying now and "upgrading" later is stupid, you'll just waste money. Wait until you can afford to do it properly. Also... don't order stuff from foambymail or other dodgy retailers... the foam isn't meant for accoustic treatment (wrong pore cell counts/densities etc.). If you're going to by foam products (which I highly do NOT recommend), stick to Auralex etc.
Moving along... In a room that size, don't waste time with difussion; you just want absorbtion. In order of necessity:
1. bass traps in rear corners
2. absorption either side of the listening position (to catch early reflections)
3. absorption on the rear wall
4. bass traps in the front corners
5. absorption behind your speakers
How high is your roof? Do you have carpet on the floor? A general rule of thumb is to keep either the floor or the roof "live", so many studios do not treat the roofs unless they are very low and cause early reflections.
The best way to do all this? Build some square frames (a box with the front and back missing) out of mdf or particleboard and put some slabs of 50-90kg m^3 fibreglass/rockwool in there (roughly 4" thick). The higher densitiy, the more bass will be absorbed, but cost will be higher. Then wrap the whole thing up in hessian or some other material and staple it down. Done!
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