A good budget and I'm with Dave, if you want to spend that much buy new.
I think you need to give a bit more info before anyone can suggest makes and types of SIB.
What and where are you going to use it, store it, launch it, transport it.
I have just ordered an Excel Vanguard XHD435. I just need a motor to get a motor for it.
I will make a separate post about that, as I'm unsure what size to get.
Are you trailing it or “blow & go”?
I have a 20hp Suzuki on my Volaire, it’s about as much as I can man-handle. Any heavier & it would have to be a permanent fix on a trailed boat. I wouldn’t want anything any smaller power wise though.