You are all awesome! Seriously, I really appreciate all of the suggestions, even if not all of them will necessarily work for me. I know I'm in a tough size range for finding bras in general, so it's great to have so many options.
Unfortunately, I really need to purchase something that fits my actual cup size this time around. I didn't mention it in the post, but previously I bought a Shock Absorber in a style that only went up to 34DD, and I know I just can't count on enough support, volume, or the right shape from that size.
I think I'm going to give the Shock Absorber a try now that I realized that $39 is the NORMAL price, not a sale price. I also like the fact that it fastens in the back - I find this much easier to get in and out of than the bras that you have to wiggle over your head, and I like the ability to adjust the band size as it stretches out.
If I need a light bra for yoga or something similarly low-impact, I might give the Champions a try since so many of you recommended them. At least with Champion, I have the option of trying one out in stores to see if it would actually fit me the way I need it to.
Again, thanks a bunch for so many helpful suggestions!