I really like my 5800, as far as I'm concerned it does everything the iPhone does, some things better - expandable memory, replaceable battery, MMS, copy/paste. The little stylus is v. useful too and cleverly unobtrusive. The screen really is great too, very sharp and vibrant
That said, the App store is great on the iPhone and there isn't anything comparable, although there are plenty of apps out there, Google Maps, Mobbler and suchlike are great
Yes, the iPhone is undoubtedly 'cooler', but if but if you want a well-priced phone with a good touchscreen (and it is v. good), WiFi, GPS, Music (not locked into itunes) and suchlike, you could do an awful lot worse than the 5800 IMO.
*edit*
Also, why not get a 5800, then when the new iPhone comes out in say, September, you'd already have saved £150 towards one if you wanted to get one
