No 3G only that I can think of. Be aware that the US & US influenced countries also use 850MHz for GSM. Whilst 1900MHz will give you some coverage, in many areas you will need 850MHz as well.
I have a triband 900/1800/1900 that I brought to the US when I moved here but its coverage isn't as good as it could be. I'm now getting a quad-band phone - a Motorola MPx220. Windoze unfortunately but I can't justify the cost for the A780 with the Linux OS.
AFAIK, only Motorola does quads + one or two of the high end PDA manufacturers with a combo PDA/phone.