thanks for the replies everyone. I won't be driving this much in winter so perhaps the Amsoil MTF is the best choice of the two, I'd like to go a bit thicker than atf, so I think Amsoil is the choice. I've used it before in other transmissions, but I've never owned a getrag. If it works in the BMW getrags it should be good in mine.
VNTS, I really like my Caliber SRT4, the styling of the caliber 0is a bit different but they dress up the srt4 quite well. Maintenance wise there is little to do, the maintenance intervals are pretty long on all fronts. Oddly the owner's manual tells you very little about basic maintenance, they even want you to take it to the dealer to change headlight bulbs. This is the first vehicle I've owned that doesn't tell you how to change tires and no lugnut tightening specs either.
I owned the previous generation srt4, the caliber seems to get better fuel economy from what I've seen so far. I've been pushing it pretty hard at times, if you stay out of wot situations the fuel economy is quite good. I expect it to be pretty good on fuel. Lots of great features and options on this car, I enjoy it very well.
Thanks for the quick replies, now to get me some amsoil mtf from my local dealer.