Samsung Infuse 4g, I HATE it compared to my iPhone 3Gs. I had the iPhone jailbroken, and of course I rooted the Infuse. Still stuck on Froyo because Samsung sucks balls. They released GINGERBREAD finally a couple weeks ago, and then pulled it because it doesn't work right and HDMI port becomes useless. I don't know much about roms though, so that I can look into.
... This Samsung freezes once a day, randomly reboots, and doesn't have Scramble with Friends yet like iOS does
OH, and to really root this Infuse, I had to go through all this bulls*** of replacing the SU binary and a bunch of other crap... lame