1500 pts is a pretty good starting number imho ; easy enough to collect (especially GK), and high enough to play multiple unit choice.
I have a pretty limited budget for the next weeks/months, so i need to play with what i got, so here is my first GK list, that i hope to try out for the first time somewhere in july ;
1 Brotherhood Banner
All i'm missing is a single paladin to finish purchasing everything, which will also give me my extra psycannon. 1 solo paladin is pretty easy kill, but i want to keep a bit 10 man unit just so i can split them up if needed, or keep them as death star if required...