Production, blade tech or uncle mikes if you plan on doing any USPSA matches. If not then a ghost or CR speed depending on the gun you use.
My Uncle Mikes G17 holster cost me $15 and gets me to my gun just as fast as anything else out there.
Limited/Open, Ghost is the way to go for an STI/SVI, 1911 with a round triggerguard I would go with the muzzel platform ghost or a CR Speed
Stay away from Safariland, if you need to buy a secondary "walk through strap" to keep your gun off the ground then the holster doesn't work.
The Aluminator is only good for getting scrap aluminnum way above the price of scrap.
There are other Ghost type holsters out there, Limcat, Garcia's extreme, but the ghost is a better rig.