I would have to go ISTJ. I've known several ISTJs and ISFJs among my friends and colleagues, and have been consistently impressed by their precision and attention to detail, as well as their prodigious memory. Si-dom is a powerful and underrated talent. Contrary to the image of Si-doms as dull and rote people, some of the ISTJs I know have rich intellectual interests to rival those of any INTJ; they just conceive of them in a fundamentally different fashion. All in all, ISTJs cover the bases of skills I want and don't have, though I am sure the grass is greener on the other side. One of my coworkers is an ISTJ woman who idolizes me.
ENTJs are also a good choice and show impressive confidence and leadership skills. I have no inclination to lead however, and have been generally disappointed by ENTJs I've met off of this forum. Somewhat weak reasons, but enough that ENTJ would place under ISTJ for me.
INTP would be interesting, though I would really rather not be a P-type, on account that meticulous planning is a huge reason I've gotten to where I am. I also don't want to place on the Ti/Fe-axis, since I greatly prefer Te to Ti (as I find the latter too prone to navel-gazing and not grounded enough) and Fi to Fe (the latter is far too nosy, and cannot help but involve itself in other people's personal matters). Those preferences apply doubly to INFJ, on account of it being an Fe ego type.