I've heard a lot of bad reviews of the Dolphin in regards to the tail moment not being correct. I'm not sure that ever completely got fixed.
Things I found out so far.....
Tony @ Pilot said that the Predator 1.8 will fit the Rabbit VT-90....none in stock, min 8wk delivery
Dirk @ Pacific Jets said that the Mini T-1 won't fit the Rabbit VT-90. Its on the lower end of the T-1 power requirements but the price point is so much higher....none in stock, min 8 wk delivery
Ventrix threads are pretty quiet with no real flight reviews (probably the most favorite of the wood sport jets, but not my first choice).
My budget is closer to $3k but not over that, but the jet needs to be plug a turbine in and go fly. The F-16 or the Falcon are looking like more along the choice with 8wk delivery. I can probably get one of those up and running in that kind of time frame.