I use the GI Second Wind which has a regular pump with a threaded co2 intergrated.. So you can use threaded co2 cartridges and if you run out of those can use it as a standard pump.. They work great..

http://www.nashbar.com/profile.cfm?c...3A%20Inflators

If you are set on just getting an inflator, the silca co2 is great.. You can regulate the co2 much better than some other inflators and it is very small..

http://www.biketiresdirect.com/psneo...nflator/pp.htm