Given that you don't have the boat yet i'd wait unless a superb deal fell in my lap.
Icom give dealers special discounts for boat shows, for example i got:
My 601 @ the ex. VAT price (but incl. the VAT)
+ A free "CommandO Mike" which i might install for the co-pilot
Either way i got a £100 - £150 free bit of kit and a 17.5% discount.
The company were called Nautequipe, i've mentioned their contact detials on other posts, do a search if you want to call them. I've used them since, most helpfull.
It spounds like you might be increasing your budget! If you are i think it's a good move. I set myself a £1000 electronics budget and, although i blew it to £1200 1/2 of that was on the VHF! I decided to skimp on the chartplotter rather than the VHF. All IMHO of course.