I am intrested in buying a 229 in either 40 cal or 357 sig. what are the differences in the two rounds also can they used the same mags? where can i find more info on the 229? whats a good place to buy one? what about hicap mags? thanks

.357 sig is basically a necked down .40 SW supposed to be similar in power to a .357 magnum?
They use the same mags, should just be able to swap barrels between the 2 calibers, however your sights may be off because of the different ballistics between the 2 calibers.  CDNN investments may be able to hook you up with mags, and the may have these pistols in stock.  If not  check the EE or Shotgun News for ads and have a dealer order one for you.

CDNN had LE marked demo mags for $18.99 down from the crazy $70 prices I have seen.  You may be able to find a used police trade in pistol in good condition with holster wear.  The only flaw I have seen with these pistols is the Blueing on the (stainless) slide wears more than others I have seen.

Good luck,

My Sig P229S is my favorite shooting pistol. Lots of power, surprisingly mild to shoot. Factory 125 gr FMJ (cheap stuff) chronies at 1375 fps avg. at my range. The mags for .357 & .40 are the same.
http://www.sigarms.com/products/classic-compact.asp