My favorite for getting really deep while still making eye contact is one which I've never seen illustrated in a sex manual. It starts with the woman slouched on a chair with her ass fully hanging off the end. Kneeling directly in front of her, insert a few inches of your cock inside of her vagina. Then, lift one leg over your arm and then do the same with the other leg/arm. Finally, with her legs still being lifted over your arms, have her grab onto your forearms while you grab onto hers.
Then you can gradually work the rest of your cock inside, as far as she can take you--I say this as it allows for VERY deep penetration. But not only that, you both have full freedom of movement in every direction, so that you can do any depth of thrusting, as well as any angle. As a bonus, if you're exceptionally long, you'll wind up making a very noticeable belly bump with your cock, which is something both of you can view from this position--every woman who I've been with has found that sight quite arousing. Both parties also have an excellent view of the junction of your coupling, which not many positions afford.
It's been my experience that both parties find this position incredibly satisfying, provided you take care not to go in deeper than she can comfortably handle--important if you're longer than 8 inches or so..