I hope this isn't in any way a violation of forum rules (if so please inform me), but I found a great site. www.mototone.co.uk has mp3 ringtone downloads and wallpapers specifically for the V300, V400, and V600. This is the only site I could find the mp3s on. It is $3.50 a month for unlimited download.
I am in no way affiliated with the site besides being a customer and this is not an "ad." I just thought it was great and you guys would like to know about it.