Best place to get the 5500 is EBay. Got mine for £175 from there, boxed as new!!!
They are good. Not got the camera so not sure what thats like. QTopia is OK and there is plenty of stuff available (see Killefiz). Opie is much prettier but seems a little slower and I cannot get it to Sync with outlook either. I got the latest release (opie) the other day and it only took 2 hours for me to crash it!
The best thing about them is the Keyboard. Its amazing how quick you can get just typing with your thumbs!!!