Why a top-slider? The side-slider seems to give so much more real-estate for keys. Is it just the portrait display of the screen you want, or do you actually prefer typing on the top-slider keyboard?
Personally, I find the on-screen keyboard fine for the ham-fisted one-handed typing of short messages, but I want the maximum width and real keys IFF I have enough to type to justify switching to two-handed typing. So the side-slider seems like the better form-factor.
I still use my N86 for everyday use.
http://www.gsmarena.com/blackberry_torch_9800-3203.php
http://www.gsmarena.com/nokia_n86_8mp-2713.php