Filco (MX)
HHKB (Topre)
Ducky (MX)
Realforce (Topre)
Leopold (MX and Topre)
Vortex / KBT (MX)
CMStorm QFR (MX)
Keycool (MX)
That's 8, sorry, couldn't limit it to 5. They're all worth the money assuming you choose wisely (that you choose the right tool for the job). There are different sizes, layouts and switches between the brands.
60% size: KBT Poker II, HHKB
In between 60% and TKL: Filco Minila, KBT Pure, Leopold FC660M/C, Keycool 84
TKL: Filco, Ducky, Realforce, Leopold, QFR, Keycool 87
Full size: Filco, Ducky, Realforce, QFR, Keycool 108