Cheapest way to get the "Menzerna look" is the super IP PO 83Q and the Micro polish PO 87MC. $60 bucks less 15% and you're good to go. The regualr intensive polish is nice as well, but the super IP isn't as strong as the power gloss, so I'd think having a somewhat strong polish like it would be of more benefit than the regular IP.
And as far as 87MC vs final polish 2, I don't have a direct use with each, but have heard that the micro will finish even better than the FP2.
And the 106FF fits in between the 83Q and 87MC, can be used to remove marring as well as finish too. Problem is, on a badly marred car, you're going to need a aggressive pad to get the marring out, thus leaving some micromarring that will need another pass with the polishing/finishing pad. So if you need to go over the area twice anyways, why not just save some cash and buy the 32oz bottles that are $30, not $50? Admittedly though, many others would probably agree that having one polish that does it all is ideal, so your choice there.