I will be using the Lumia 800 as my main phone, because it is incredibly well build, and just feels solid. Also the curved screen is like porn for fingers (its wierd how much of a difference it makes).
For some reason the Samsung Focus Flash doesn't get great signal with Virgin (it's fine with others, but I am Virgin) - if it did I may consider using this, because although it feels cheap, it does have a gyro and FFC.
I've got the HTC Mozart and though it's a lovely phone it's got two big problems:
1) Unlocking the phone doesn't always work right. I see lots of people have that problem. I found that touching the side and the screen of the phone the same time while sliding the lock screen works.
2) The back button is ridiculously easy to press by accident.
Otherwise the phone rocks. The sound quality is just outstanding.
My contract is ready for an upgrade though and I'm thinking of going prepaid until the Windows Phone 8 phones ship. It just doesn't feel worthwhile getting another phone right now while I'm happy with the Mozart.