As you probably know, there are a few Razr models overseas that aren't supported by any carriers here. Still, they can probably be configured to a US carrier's
wap and sms settings if you know the right people (check our motorola forum and look for posts by the mods there!). I found a site where you can check the models of interest (even the international models) and compare them side-by-side but their site is in frames and I can't post a direct link. Halfway down
this page, the Razr models begin, check the ones you like and click compare for a side-by-side features comparison.
I hope this helps clear up the confusion...
As far as your ringtone question... hmm, try searching the ringtones forum for RAZR or searching the motorola forum for RAZR RINGTONES that might find some answers...
edit: actually the site i linked you to has user reviews and several people commented on making their own ringtones with the v3... i think that answers that question.
