Favorite current toy is a sort of modified OTOUCH AIRTURN2.
The awesome combination of sucking and vibration is unlike any other sex toy I've shoved my cock into. Unfortunately, its canal is made of a kind of stiff and hard rubbery material, and its not super deep (my dick is pretty average). If I was much girthier, I think it would be painful, even with lube. But the combination of the stiff material and me not being super thick, the suction isn't really effective on some of the settings.
I realized that if I cannibalized a "single-use" Tenga cannister toy and used its vaginal insert (which amounted to a really, really thick condom), it was really tight -- I can't get into it without a LOT of lube -- but had some squishiness that felt great around my erection and made the suction effect really awesome. It's so tight I just leave it hands-free sucking and vibrating on my dick while I sit at the computer.