Personally I would go sim only and wait, the desire is still a very good phone, and you won't see that much improvement going to an S2 or similar
struggling for a few months to type and keep my music organised on a HTC Desire HD.
Personally I would go sim only and wait, the desire is still a very good phone, and you won't see that much improvement going to an S2 or similar

Never really had much of a play with Sense, always used Launcher Pro with every Android I've had and most mates do too. Does it really add much?
The quality of the screen on the GS2 is something else though!