what do you mean nothing impressive???
sounds like that system will rock! way too nice for a college set-up...watch out for noise violation tickets, I got my share during college!
About room acoustics, sounds like your on the right track with the plywood to enclose the room. make it as solid as possible w/out investing too much $$$. youll have plenty of that when you get your own house! Spikes or no spikes shouldnt make that much of a difference. some might argue but it shouldn be that noticable. if you want BOOMier base, then put the sub in the corner. i would spend time moving the speakers around and finding the sound you like. be carefull...and remember to put things out of the way...I lost a loty of equipment in college because my drunk friends thought all my stereo equipment were coasters, chairs and on a few occasions...toilets!
Good luck and have fun fine tuning!