I've a w810i...

And am quite happy with it, it has some shortcomings but is generally the best SE phone right now I'd say, in price-quality relation. Most new phones are either w810 or k790 rehashes... My mother has a k810 (was previously my brother's and she had an awful motorola) and when confronted with the choice between w810 or k810 I chose the former, the k810 has a better but not really that good camera (Also camera ain't very important for me), resulted in an overall worse product, it has failed more than the w810 in less time... (Half the keyboard doesn't work and the backlight is burned), etc...
The w810 offers me great things like a nice interface, decent musical capabilities and a lantern. It's downsides are no AD2P, fastport and memory stick (LOL SONY PROPIETARY TECHNOLOGY)
Also the fastport tends to fail a lot in Sony phones, which is not nice since it's used from everything from charge to listening to music.
My father has a Samsung F250

And it seems like a pretty good phone overall, I haven't tried it extensively but the interface seems nice and so do its musical capabilities. Uses micro-SD and has 3.5mm output for music or propietary output for headset (which can also be stereo)/charging/usb cable.
And then my brother has a 16gb Iphone 3g

And it just seems like a great phone. True, it's lacking a lot of features but after seeing him use it, it's mostly things I wouldn't use atleast. The variety of applications and 3g and GPS (Even though in Chile it's not 100% functional) is really great. Downsides would be no mms (Who the fuck cares), Bluetooth has no real functionality (Pretty important but this will probably be fixed at some point, officially or not) and headsets are expensive because the original apple accesories suck.