I haven't had many Benchmades, but, as far as spyderco goes, I'll list them in the order of the ones I used the most (which kinda tells you which I thought were best):
1. Gayle Bradley (the only one of these I still have)
2. Southard
3. Tenacious / Endura Wave (tied, carried as a pair)
4. Manix XL
5. Paramilitary 2
6. 110v Forum Native
Those are all I ended up really using. As far as build quality and beauty:
1. Vallotton
2. Southard
3. Gayle Bradley
4. M390 and CTS-XHP PM2s (Only PM2s I've had that had zero play and a glassy smooth pivot from factory)
I've had many more, but they don't spring to mind and thus must not have made much of an impression on me.