sorry!! ha ha ha.. i'd go for the powder doll.. i mean, i have combo skin where i'm oily i the t-zone so i used to use the powder only. now that the fluid is out, i use either or, depending on how i'm feeling. if your skin is oily all over tho, i think powder would be better for you.. that's imho tho
studio fix would probably be better. that's the powder foundation. i think juneplum is saying it'd probably be a good idea to get some blot powder as well and use it on top of the studio fix to control shine.
I have fairly normal skin and use Studio Tech in the winter/dryer months and Studio Fix in the summer when I may be a little bit more oily. So going by that, my thoughts would also be Studio Fix. You should ask at the MAC Counter if they could put it on you so you can see the texture of both.
I have oily skin and I use Studio Fix, which is a powder+foundation. And they've just come out with Studio Fix Fluid which has the same matte finish as Studio Fix but in liquid form and you can use loose or pressed blot powder to matte away any unavoidable midday greasies.