www.packing.org
There has been numerous threads on this pistol. Do a quick search and you will find more info and opinions than you can read. It's also a very good reference for state CCW laws and such.
As for my opinion, there is nothing wrong with the Kel Tec pistols. However, bumping it up to either the .380 +p or the 9mm wouldn't be a bad idea. Kel Tec makes affordable pistols in both of those calibers.
Either way learn your pistol and practice till you can't stand to smell gunpowder. Then practice some more. You should also consider getting some training. This may not be possible if you're strapped for cash, but always keep that option in mind.