Actually the older HVXs even shoot 1-60 over and under crank. Just have to know the little trick ;).
Also, many people may not know this, but the HVX not only shoots over and under crank, but it also shoots at variable frame rates. You can shoot at any frame rate that you can over/under crank to. You just have to know how to. I use it ALL the time when shooting urban. If I need that extra stop or more light in, but still want audio and dont want to over crank, I will shoot urban a lot of the time at 36 fps. Captures audio and with a film shutter is 1/36 at 354 degrees or whatever it is. Allows me more manipulation of the footage then 30p would.
My suggestion is, buy a t2i separately.
Everything has been covered here that i really want to say.
But i will say, if you cant create an image you are happy with using an HVX, there is no way you will be able to create it with a DSLR. Just saying.
I just feel like you must have not played with it enough if your complaining about noise or crispness. Use the cleanest gamma curve (b-press), dont boost the detail level since above 0 is fake. Use Coring when neccissary, ect.
I dont have any nosie or crispness issues and I have owned my for years. These are all things I learned the first week I owned the camera and then played with to make it look good.
BTW, I own a t2i as well as an HVX, and I still love my HVX just as much and will still use it as my primary camera for skiing (probably not other stuff).