For runs that long you really should have 10 or 12ga wire. I highly recommend some Belden cable sold by Blue Jeans. I think this would be very suitable for your system and it just happens to be cheap! Buy in bulk and terminate it yourself and you will spend less than $100, but don't let that stop you.
I'd like to upgrade my speaker wire
I am fairly new here and still learning. I have a Yamaha R803 receiver and Vandersteen model 1s. I'm happy with them for now but I'd like to upgrade my speaker wire. I presently have 14 gauge wire I bought years ago at Best Buy. I need 40 feet. I've read great reviews about Back Cat but I think 40 feet may be a little pricey for me. I'd greatly appreciate any advice on a good quality wire at a reasonable cost. Maybe under $500? BTW, I bought Jim Smith's book as recommended here, great advice, thanks. Doug