You won't need to upgrade until you do your plenum... then i would use a Q45 TB, i got one of the ebay/universal TB's and it stuck open at rev's so u needed to give the throttle a stab to release it (not a good thing in a 450hp car). Also it wouldn't shut enough on 0% throttle so it would idle on about 1300rpm, and u need to get a flange welded on so when it gives u the Sh)ts u have to cut it off and try not to destroy ur plenum... then u'll just go spend $160 on a Q45 TB anyway.... so they are a waste of money,
Just my 2c on the matter lol....