I'm assuming you have 1Mb+ DSl/cable ?
Yes switching from wireless to fixed line should increase your "consistant" LAN speed as wireless tends to go up and down a bit and the protocol overhead is higher than for fixed line providing a smoother surfing experience.
eg. my PDA connects @11Mb but throughput is about 1Mb
wheras a fixed 10Mb lan can sustain 4Mbp.
But as said by others it's the speed provided by those with the "parts" of the file that's important.
Personally, I think
torrents are rubbish, way tooooo slow and your Ip get's hits from others trying to get "parts" from you upto a week after you've stopped using it ! Just no need with high peed internet these days and barely usable even in the old K56 dialup days.