+1 on the RI tactical or if you can swing a little extra the STI spartan. If it were me, I would go with the spartan for the little extra. STI parts which are top notch, ADJ sight, FO front. 45 will allow you to shoot major. 9MM is minor but allows 2 extra rounds. If your buying factory especially, 9mm is MUCH cheaer than 45 acp. Reloading helps take some of the sting out of the 45ACP and allows you to load closer to the 170PF range than the 190+ of factory 45. If your reloading and looking for major I would say 45. If your buying factory and dont have a big ammo budget, I say get the 9mm and work on your A's and have fun doing so for less money. On the mags, the 45 mags can be had cheaper than the 9mm mags. The CMC 45 mags are probibally the best value out there in mags for the 1911. Work very well for less than the wilson/tripp mags.
Shootersconnection also carries the STI spartan as well. Both are good companies to buy from.