Advice on Home Theatre components...

Hey guys, I'm a relative newbie to higher end audio, and I can't really afford a lot of the high end stuff that seems to be pretty standard on here, but I wanted some advice on my system if anyone is game. I just bought a new house, closing is sept 1st!) and the designated room is 23'x15'

I currently have:

Recently purchased:
Receiver: Denon AVR-3805
TV: Samsung HLN507W
CD/DVD player: Sony DVP-CX985V 400 disk (was a gift)
Monster MP HTS 3600
Cables: Monster Cable Interlink Datalink 100, and M series M500V x2.

Several years old:
powered Subwoofer: psb Century subsonic 2i
center: psb century 200Ci

~15 yrs old:
Front speakers: BIC America Venturi V830 (x2)
Rear speakers BIC America Venturi V52 (x2)

Other:
PS2, VCR, etc

On the right front speaker, one of the woofers moves freely when pushed in, but the other has a slight grinding feel to it (still sounds ok though). The tweeter on the front left speaker is gone. I probably have to replace the front speakers and possibly rear/center to match it since I can't even find SPECS on these things, much less replacement parts.

Anyway, I've gone on a few trips to some stereo shops to listen to some speakers, and I really liked the Martin Logan electrostatic lines, (Clarity, Aeon, Ascent front, cinema center) but I was concerned with the dispersion (~30 degrees?) I'd also like to keep it semi-reasonable pricewise. My main use for the system is for movies, football games, etc. I do listen to music on it, especially when friends are over, but I'll be honest, I do most of my music listening in the car. This system would be mainly for movies.

I wanted to know what you guys suggest. If I have to replace my speakers rather than repair, what kind should I get? What are the weakest points of my system? (Like I said, I'm new to this). Do I need to have the front/rear/center speakers from the same company? I was hoping to keep the speakers under 3k-ish (under 2k would be even better). Used would be fine so long as they're in good shape. What other things should I worry about? I've never set up a high end system before, so forgive me if the answers to some of these questions are glaringly obvious.

Thanks in advance!

-Mike