Thanks guys for your responses - I haven't been on this forum for a while (been spending time working on boat!).
I got Bravo 300HP Seacore (FWC) engines with 3 year merc warranty, plus DTS and Vesselview 7 and really happy with it. Currently testing out props through the (Merc) dealer - am posting question on props in another thread. I have to say the DTS makes a big difference. Did heaps of other stuff at the same time to the boat - rewired with Czone, repainted, wrapped with graphics etc. Has taken a lot of time and $ but best thing I ever did.