Check the sticky (which SIB) for thoughts on airfloor vs hard floor, re-sale when the boat doesn't work as you hoped etc.
Think carefully if you really want/need a hard floor.
If spending that sort of money and assembling it every time then for me (personally - only an opinion
) I'd run a mile from a brand new Chinese SIB and buy something like the much discussed Humber (or an equivalent Avon etc) on the 'SIBs on eBay' topic.
http://www.rib.net/forum/f50/sibs-sp...tml#post750666
Unbelievable quality in comparison and you get so much more boat for your money that will soldier on for decades, looks a million dollars and will lose you absolutely nothing come resale.