+1 on the EF CO2 1911. It's the one to get if you can only have one. Why? You can play in cold weather, a GG pistol is not reliable below 60 deg F, and essentially unusable below 50 deg F. Also, good retention holsters are inexpensive and readily available.
I have 2 KWA pistols, and I really like them.
Whatever the brand, unless using it as a primary at a CQB field, rails are of limited utility. Rails make it hard to get a good holster. Tac lights are nice, but some fields ban lasers (they are allowed Airsoft Arena or Fear City at this time).