Check this article out if you're interested in an electric pump:
www.mcnews.com/mcn/features/Novpumpstest.pdf
They were a fan of the Slime Power Sports Tire Inflator at $34.95USD.
Aerostitch link I posted above has the Stop n Go kit without CO2 for $32.00 (and yup, you can probably get it cheaper elsewhere

). Than and the Slime pump wouldn't be too much more than the Stop n Go kit with CO2, and seems like a really good setup, if you don't mind a little extra to pack.
BTW - this is totally off topic but if you do put in an order with Aerostich throw this into the basket:
http://www.aerostich.com/catalog/US/...w-p-16686.html
It really is the best invention since the frisbee.