Second hand I reckon you can get a bit more bang for your buck.
In my experience decent pads are where you should not skimp.
I bought some bike-shop cartridge pads when in a tight spot and they lasted approx 2 weeks each pair, and didn't really slow me much whilst they lasted.
Sweet, just bought a Deore LX for £3 on ebay, got some kool-stop pads
Sweet, just bought a Deore LX for £3 on ebay, got some kool-stop pads