I have collected a total of five mechanical keyboards. The Unicomp is my favourite but I only use it at home due to the noise!
Unicomp Classic 101 with buckling spring switches, kindly donated to me by Bryan Law-Smith.
Filco Majestouch-2 TKL with Cherry MX Blue switches and /dev/tty keycaps.
All but the DAS keyboard have the US/ANSI key layout. I prefer this to the UK layout since the syntax of programming languages seem to be designed with this layout in mind. Having lived in the US for a year I got used to this layout too. I map the dollar sign to sterling to get the £ symbol:
xmodmap -e 'keysym dollar = sterling'