Thanks Gareth your post was very helpful. The power signal boost is going to be the most useful thing for me and I have started to use torrents.

Multiple SSIDs never even thought that would be possible!
Thanks again everyone that replied. I will probably flash it with DD-WRT on Saturday. If you don't see me on here after Saturday, my router isn't working.
---------- Post added at 20:13 ---------- Previous post was at 18:16 ----------
Hey guys, guess what? I couldn't wait till Saturday so I took the plunge and flashed it. I have to say, it was a lot easier than I thought it would be.
Had a quick look at DD-WRT firmware and I have to say I'm really impressed with it. I can't ever imagine going back to the default Linksys firmware.
I turned the power signal to 50, will have to test it out tomorrow.
I want to thank everyone again for helping me. Couldn't of done it without you guys.