Thanks for all the help and suggestions, I have decided to go with a brand new Thundercat package. Boys and their toys, eh!
I had origionally planned on selling the sports cruiser and buying a decent diesel RIB, but I like the sports cruiser too much to sell outright. So I still have the sports cruiser for the sunny days and i'll have the Thundercat for messing about in/using as a tender
Engine is coming next week, boat is being delivered mid March
If anyone has one of these, or similar, any advise etc appreciated!