I like them big, so be forewarned.
Tantus Severin Medium
Sasha Grey Large (though any size would be good)
Vixen Tristan 1.5 vibrating
Doc Johnson Big Man
Ryder is very good as well.
Others I mostly like, but have some issues:
Pure Plugs - feel great, but the base is too big for me - if I sit down the plug gets pushed up into my prostate and makes it tender