Sound Marine Diesel
2 more cents....If you look at Beta you might want to get a quote from Joe DeMers at Sound Marine Diesel in Connecticut. I live in Texas and mail ordered mine from him. Joe is a wealth of knowlege and the savings from not paying State taxes more than offset the shipping costs. That, and he can get you everything else you need for the repower.
soundmarinediesel dot com
Also, if you compare Yanmar with Beta just based on list pricing, I seem to remember that it wasn't apples to apples. Just make sure that transmission, couplings, etc.. are included in both prices.