Not sure I followed all that, but it seems to me it's the ask wall at mintpal that will hold zeitcoin down. The price at cryptsy will roughly mirror that. While it's currently a little cheaper to buy on cryptsy for ltc at current exchange rates, the fees are higher there and the ltc/btc price is pretty volatile. Aiming the pool to buy from mintpal is the right choice imo.
I've got 24 MH/s on Vertcoin at the minute. Equivalent is about 60 MH/s on the multipool, is it worth me switching? My electricity bill is about £85 to £90 a day.
Wow, Dale with the big scrypt cannon.

Right this second, I would say definitely because vertcoin diff is really high, the price is fairly meh atm, and scrypt-n is so much less efficient. Whether it's better longterm or not is a difficult question as there are many constantly changing variables. As long as wafflepool mines what's most profitable I suspect you'd be better off with zeitpool.