Any of the newer HTC's. Sensation if available. HTC has a solid reputation (although the initial release of the Thunderbolt had some software issues which have since been fixed)
Samsung Galaxy 2. All the reviews of this new sweetie are good.
If the have a good deal on an HTC Desire (original), it's a rock solid phone, although internal memory is small.
Whichever you get, I would buy a GSM phone and not a CDMA. If you travel a lot, as GSM will allow you to unlock in most cases, and use a local SIM card from a different provider. Thus avoiding roaming charges.