I know a lot of guys say "the wire doesn't matter' BUT I have had speaker cables make a difference in sound, mostly because of bad connections and sub par materials, so it can make a difference... But I agree Don't spend more than a couple bucks a foot MAX...
The other issue and more important is aesthetics, you want something nice, with nice plug ends that don't have frayed wire sticking out of them... At the very minimum I would use a decent cable and tin the ends before you connect them...
Knu concepts karma cable is really nice stuff, I make my own cables with the karma cable, the sewell banana ends, shrink wrap, KNu Konceptz cable pants, and techflex there are a couple threads on here on how to do it, it ends up costing around $15 a cable depending on the length...
But if you want them done Parts express used to sell a decent cable {dayton, but they don't have many left" and emotivas cables are good for the money, but you best bet is to make them your self... Monoprice is also a good place to buy cables... Just depends on what you are looking for the end result to look like and what you want to spend, as far as audio quality it doenst take much...
unless you want some audioquest wild woods, best sound EVER -
AUDIOQUEST WILD WOOD SPEAKER CABLES (PR) at Music Direct LOL , make sure to scroll down in that link and get the 10footers they are only $22K each... I wish if they ever actually sold a pair of them?
Seriously though check out mono price and knu concepts, if you are going to use tech flex to cover them the mono price is nice,
sewell sells banana plugs for $28 for 24
Amazon.com : Sewell Direct SW-29863-12 Deadbolt Banana Plugs, 12-Pair : Electronics
wire pants-
Amazon.com : Speaker Wire Pants 12 Gauge Y Boot -10 Pack : Electronics
tech flex {3/8 or 1/2 works nice for speaker wires and they have a ton of colors}
3 8 Braided Expandable Sleeving Rattlesnake Techflex 25ft | eBay
same seller sells the shrink tube, a lifetimes worth for $5 and he has other colors
1 4 3 8 1 2 3 4 1 0 Heat Shrink Tubing Black 4 ft Each | eBay
then just the cable
Amazon.com: KnuKonceptz Kord Kable 12 Gauge Copper Speaker Wire - 50 Feet: Electronics
Amazon.com: Monoprice 100ft 14AWG CL2 Rated 2-Conductor Loud Speaker Cable (For In-Wall Installation): Electronics
there are a ton of options for the cable, just depends on what you want...
this way will cost you $6.65 plus .90 per foot, per cable - so a 12 foot cable will cost you $6.65 + (.90x12) = $17.47 which comes out to $1.47 per foot using the knu cable, {the longer the cable the less per foot it will cost}...
I made the cables for my 2 channel system and it cost me around $25, for my home theater it cost me $60 {but one of my cables is 20 feet long}...
So in closing you may not NEED a new cable, but I find with a nice music system, its nice to have banana plugs, covered cables, and wire pants {even though it wont change you sound quality, it looks good and makes connecting and disconnecting easier, some say banana plugs add resistance, but I have never heard a diff. either way}.. the same things go for running speaker cables on the carpet, I use risers on my 2.2 system but that is more to separate the audio cables from the power cables and again it looks good...