Welcome aboard!
I can certainly help you out a bit on the VP 4.3 questions... re the prop, don't repair the Al one - not worth the effort and cost, and they never come back anywhere as good as a new one. Almost the same cost to buy a new genuine VP one. I would recommend sticking to what the boat came with originally from FW - they would have done plenty of testing to make sure it was right!
I bought mine on sale from
http://www.getaprop.com/ - they have genuine VP ones at the moment for $153.
Yep - the seat post - +1 on that! Luckily I have the bolsters.