Mesh heads. They are going to be more "bouncy" and not "feel like acoustic", but I got used to it quickly and that became a non issue. Generally, more plies = less bounce. I use 3-ply Real Feels on the toms, Dolby 3-ply on the snare (better response for quiet 2 stroke rolls), and a single ply Silent Stroke on the bass. I suspect the choice of heads, as long as multi-ply, is not crucial when starting out since you have to get used to them anyway and the rebound is dictated by head tension.
Triggers are all over the place on technology and price. I did my conversion not knowing whether I would like it, so I went cheap and easy. DDrum single zone Red Shots, mount under a tension rod and <$100 for a set, for bass and toms. DDrum dual zone Acoustic Pro for head and rim pickup on the snare, mounts on hoop and $60. I am a jazz guy and have been happy with their sensitivity and dynamic range. Missing is the positional sensing available on a digital snare, but that really doesn't bother me.
I used a Roland TD-17 for a couple of years which was fine. Upgraded to a TD-27 for better kit samples and some nicer setup options and it is finer. Used Td-17s run around $450, I bought my TD-27 for $850.
I am not an ekit expert. I don't do recording, midi, or hybrids. I am just an experienced drummer who converted a kit for at home practice and playing and who is satisfied with the results. So I won't claim my choices are better than any others, only that they work for me.