I rarely throw a 3/4-ounce spinnerbait but when I do, I put it on one of my 7-0 or 7-3 MH rods that I normally use for a football jig. Most of my warm-water spinnerbaiting is done with a 1/4-ounce or 3/8-ounce bait, both of which I throw on the 6-9 rods. I do throw a half-ounce bait in late fall and early spring, which I can do with either a 6-9 or 7-0 rod.
96CHAMP, I will say that I'm not sure I would drop $400 on a Loomis GLX to throw a spinnerbait. The reason I say so is that a spinnerbait is a reaction-bite bait and if you get too high tech with your rod, it can cost you fish. Yes, you need to feel the bite but a slight delay lets the fish actually get the lure in their mouth before you bust his chops.That Quantum rod you're looking at would probably do you a very good job.
My final recommendation before I shut my piehole is your reel. I see a lot of guys put 7:1 reels on their spinnerbait rods and end up fishing their baits too fast. I'd strongly recommend a 6:4:1 or 6:3:1 ratio, which is fast enough to burn a bait on the days you need to but slow enough to finesse it a bit on days they're being fussy.