How big of a motor can the 12th scale bud hull handle I was thinking about the 36 from the shockwave 36how would the hull handle it and what kind of speed would I expect

Largest i've seen is a .21 , but i'm no expert on hydros. Most likely someone else here can give you a more acurate ansver.
But it's not a good idea to overpower the boat. You can get problems like unstable riding at WOT, tourqueroll and flipping in turns.

maybe someone has a motor suggestion for this hull thanks in advance

Your .15 is a tight fit as it is and in a poor spot to begin with. Adding a .32 is just asking for trouble. Why you would want one in there anyway is beyond me. For it's size it is way underpowered, there are .18's that have a lot more HP and RPM.

do you have one of the 18s in mind and maybe a website with info and pricing

http://www.osengines.com/engines/osmg2110.html
You should be able to find it on Tower's site.

I ordered the OS .18 for my boat, and so did a guy i run with so to make damn sure i continued to out run him i sent my brandnew .18 to these guys

http://ebmods.com/

I've also been working with them on a .12TZ 5port mod with a standard shaft and liquid cooled head for my rigger