Nokia N97 mini. Say what you want about Symbian as an OS, it's hard to fault the build quality and overall value proposition of the N series. Having used one myself for going on a year and half, I'm struggling to find a worthy upgrade that stacks up, amidst the (wide) selection of new model smart phones on the market. Though not designed to be a rugged phone, the 97 mini, has withstood considerable abuse yet shows only minimal scaring. It's a shame Nokia are killing off Symbian in favour of Win7 mobile, call me crazy but I will always be a fan.
HTC has certainly improved a lot in the design and build quality of their phones but are yet to crack a rock solid implementation of a full slide out QWERTY, IMO. SE seems to be cutting corners with their materials and making good looking handsets that feel cheap and plasticky, while Samsung and Motorola are locked in a tussle to see who can release the most new models every quarter, saturating the market with a myriad of uninspiring, quirky phones that do little to advance the genre.
The Nokia E7 seems, on spec, like a very decent piece of kit but having tested one out recently I'm not sold on it either. It's a bit too big to be considered pocket-able IMO and then there's the non-replaceable battery and sub-par camera, all at an unjustifiably high price for the features on offer.
I'm sticking to my N97 mini for now, at least until the new Win7 mobile based models (from Nokia) come out later this year.