plz hlp!im a newbie! anyone know of ksc socom mk23

[newbiematt]

PLZ HELP!!! Im new at the gas blow back world and i need to know where i can find a KSC MK23 SOCOM !! I would love to know where there is a good place to buy this special forces pistol. I live in Chicago. I also have another question :
What is the difference between :
1. A heavy-weight MK23 SOCOM (gas blow back)
2. A hardkick MK23 SOCOM(gas blow back)
3. A Phase 2 MK23 SOCOM(gas blow back)
You help will be appreciated greatly!!!
Also, is a Usp Tactical a good gas blow back.. or does it depend on the model and company??
And is this website a good place to buy a gas blow back pistol?......http://www.airgunstore.com/AIRSOFT/PISTOLS/PISTOLS.HTM

Thanks ALOT FOR THE HELP!!!