BigH,
The Glocks make good all around guns as evident by a couple of USPSA National champions shooting them. The "Glock Bulge" you are refering to on the 40 brass is very real, but can be sized out with the Redding G-Rx sizing die or other as mentioned above. The 40 cal Glock will allow you to compete in more USPSA divisions than a 45 due to mag capacity.
I own a CZ Shadow, CDP Kimber, Glocks, SV, S&W's and some custom guns and think the trigger feel of the S_I guns is as good as it gets for a factory gun. My recommendation would be to get an STI Edge or the like in 40 cal and save time sizing the brass.