I don't know the prices in Chamonix, as I've never hired a guide there.
The glacier crossing for Aiguille du Tour is an easy one. When you hire a guide, make sure that you clearly explain what exacly your background is, i.e. sports climbing, but no mountaineering or glacier skills.
I would be hard pressed to chose between the three, since they all bring something different to the table.
When it's a glacier experience you're looking for, no doubt Mont Blanc du Tacul is the best. SInce the first day is short anyway, there is plenty of time to practice glacier skills. If you want to learn more than just the bare minimum, clearly say so when you're making your booking, and when you meet up with your guide, remind him of your wishes, for those that made the booking may have forgotten to pass on your specific details and may just have said that you wanted to climb Mont Blanc du Tacul.
For a mixed experience with a bit of scrambling, go for Aiguille du Tour - having done a fair bit of rock climbing, you'll think a rope is unnecessary for that, but with a guide he'll want to have you roped up, since he's responsible. The glaciers are easier than for Mont Blanc du Tacul. The slopes are mostly real gentle, and while there are some crevasses, it's not as serious as Mont Blanc du Tacul.
For a mixed experience but with real climbing (nothing hard, mind you, still somewhere in the lower 5th grade, but quite exposed in places and everybody ropes up), go for Petite Aiguille Verte. The glacier crossing is the shortest of the three, but you still get to see crevasses up close and personal.
As for the photographic possibilities, I think all of these are great peaks to climb.
For more information about prices, about the particulars of meeting a guide at a refuge and what exactly the consequences are of coming from a sports climbing background but not having glacier skills, I suggest you send an e-mail to the
OHM.
Oh, and if you agree to meet your guide somewhere up in the mountains, make sure that you either bring your own gear or make a crystal clear agreement on what you bring and what you don't, so that your guide brings everything else that you'll need. What you don't own, you can buy or rent it in Chamonix. Among other things, you'll need crampon compatible boots, crampons, gaiters, ice axe, harness, a locking carabiner or a couple of screw gate carabiners. For Aiguille du Tour and Petite Aiguille Verte you need a helmet too, for Mont Blanc du Tacul that's less important, though it doesn't hurt. If you want to take it a step further and learn basic crevasse rescue skills, you'll need an assortment of webbing and carabiners - you can ask your guide to bring all that.
By the way, for these three peaks, a guide can take more than just one individual client. I don't know how many, probably that depends on the peak. On Aiguille du tour perhaps just two, but on the others it will be more. The OHM can tell you.