G&G Metal Xtreme CO2 Pistol or Walther P99 CO2 Pistol?

I'm deciding on getting a blowback airsoft gun, and I have to decide between the G&G Metal Xtreme CO2 Pistol, located here; a href="http://www.airsplat.com/Items/GP-GG-XTRPS-CO2.htm" rel="nofollow"http://www.airsplat.com/Items/GP-GG-XTRP…/a and then the Walther P99 CO2 Pistol, located here; a href="http://www.airsplat.com/Items/GP-UMX-P99-CO2.htm." rel="nofollow"http://www.airsplat.com/Items/GP-UMX-P99…/a Keep in mind money really is not that much of a factor. What does matter to me is weight, blowback power, power in general and overall "sexiness" of the gun. Thanks.