I second this post. I agree with ati058 100%!From your forum name I take it that you aren't too concern about total fire power? The G23 comes with 13 rds magazines vs the 9 rds magazines for the G30. They're both compact in size but, the G23 has the option of changing calibers to a 9mm or .357 with the simple exchange of its barrel caliber.
I have the Gen4 and Gen3 G23s and enjoy shooting both at the range. My Gen4 is my daily CCW. I've never owned or shot a G30 but, I'd like to try it out some day. I believe that you'll be satisfied with whichever Glock pistols you decide to purchase. Good Luck.