#2 - Oct. 8, 2010, 4:15 a.m.
We do have an FAQ regarding Paid Character Transfers, Shauwk, that you might find of interest.
Paid Character Transfer FAQ
http://us.blizzard.com/support/article/20558
To directly address your question, you will keep any items in your personal inventory or bank, as well as gold up to 20,000 (if you have more than this amount, your character will not be permitted to transfer). Things you will lose include things that are specific to that server, such as Guilds or Arena teams.