I rock the KSC Glock19, it's my workhorse secondary. I would rather have a nice TM though, don't get me wrong KSC/KWA are great pistols but you just can't beat TM quality (or WA.... but then mags get pricey and they're usually made in limited runs).
Other than that you *could* go with a TM Mk.23 SOCOM but the only problem with that is they can be pretty pricey. I've seen them (used) go for between 300-375. Also if you're looking for blow back then the TM SOCOM is an NBB pistol (Non Blow Back) so you don't get that "realism".
ಠ_ಠLess QQ more Pew Pew
READY TO >> RACE