I would strongly suggest not to buy the galaxy s3 mini, I have heard nothing but bad things about it
It's a shame as it could have been a great device.
As above, the sensation is a good choice, also the sensation XE is really good too. You could probably get one for just slightly more than the DHD I reckon.
I still have a soft spot for my old DHD as it is a great phone
Its getting on a bit now but if you don't want to play the latest games or do anything processor intensive then it's a good one to go for