Canons from S750 to date are borderless. i850 is a real good compromise photo printer. 4800 dpi and u can get cartridges cheap or refill AND FAST, faster than i550.
Some of the newer HPs are borderless as well. But you'll go broke feeding them ink. Out of all the products HP makes they make the most profit on inkjet cartridges and Toner. Beware, HP.
If you can wait, Canon should be coming soon with a 4800 dpi 6 cartridge photo printer which will be the best yet but it will be mo' money than the i850/i550.
mac