What a great thread. Some really good stuff here.
I've got a few favorites. Nothing groundbreaking, but these all hold a special place in my minaitures pantheon.
-I like nearly all the first generation GW Necromunda figures but the Van Saar and Escher are my favorites of the batch.
My buddy painted the Escher for me.
-Denizen Ventaurans. Nice variety, remarkably sharp and fine detail and one of the best bargains in high-quality minaitures. The sculpting really holds up and only the slightly static poses and smaller size (about 27mm sole-to-eye with very realistic proportions) hints at their 25-30 year age!
-GW Squats. I can't help it. I love these goofy bastards.
-Void 1.1 Junkers. (I realize there's a Warzone commander in there...)
I've got the figs and I swear I'll finish the Junker and Squat armies someday...
I hadn't thought about it until now but my favorites haven't changed much over the years. The most recent addition to the club was the Venaturans and that was at least 7 years ago.