cupcai: what do yuo mean "full detail"....? If it's engine detail: the first one with engine detail will be the MP4/20, which is (still) not released yet. And it is a metal kit, not resin. Their R25 will have engine detail as well, but will only be re;eased after that. Their previous efforts were the F2004 (1st) and the R5, neither of which had engine detail.
I have heard very good things about it, though. Some guys commented about the F2004's sidepods being a bit too short - whether or not this is so visible that anyone will notice it (esp now that the car is not current) I will not know. I will try them out for sure some time. The stack is just too big to fit another kit in at this stage!
Here is a link to a guy that built both of their existing kits, looks good to me!
http://www.f1modeler.com/
As for resin kits with engine detail - I am currently awaiting Model Factory Hiro kits, both metal and not resin, but with engine detail, at least. (97T and BT52) And they are not as pricey as some S27 stuff.
Getting to the stage where I am about to finish and decal my current one (Revell Sauber). Will start working on the R25 after that... And yep, from what I read up thusfar, that seems about to be the gist of it: spend ages cleaning, pre-building, aligning, then give it a "quick paint and slap-together"!
Quick releative to the rest of the process, that is!