Advice: which firmware should I load for this purpose?

[solidsnake]

In my experience, girl only care about the look and interface of the phone. So she will be change many skin.
You can't install skin on stock MP, so the best is Rokr Ultimate.
Actually that what I flashed when I give it to HER

[ahmed]

Rokr ultimate is the best in my opinion..only u v3 is good but sub menu icon (like kaleidoscope) annoying me..u can make it (ultimate)faster  by overclocking programs(with shorter battery life)...and increasing the volume by volomodder one..and many other features...plus high stability of it

[Joka X]

Whatever firmware you're going to use,just remember to download lots of skins for her....oh,and solidsnake,from what i know,we can install skin on stock MP,but we have to telnet to do it...

[RasahCrigis]

vote for ROKR Ultimate. simple, stable and nice looking

[ojay]

American AT&T user here.

ROKR Ultimate is gravy.  A SEEM edit will open up the 850 band if after flashing it's disabled.  Disabled the Chinese languages while texting and such and just added WAP/MMS settings which are listed on AT&T's site.

Good luck.