801 is heavy. but very ergonomic and solid. People will get scared
but it's well made, ti handles, bearing assisted flipper and oh..ELMAX steel. The only downside is the black clip (Todd Rexford had to swallow that). For USD200, it can't be beat.
Manix LW - flat handles and thin. yay or nay depending on what you like. sometimes a narrower but fatter handle works better. Manix has a big flat wide blade - scarier IMO than 801. It looks like the kitchen utility knife - and most criminals like kitchen blades. I love it for food prep.
BD-1 - no experience, but it's a basic 440C type steel.
PM2 - compression lock. yes, depending on the width of your palm, it may have a longish handle (I personally preferred the handle length of PM1 but most people will say that the PM2 is a huge improvement over PM1). I think it's more ergonomic than Manix.
Try looking for a FFG Delica in VG10. That'll work perfect as your 3" EDC blade.