Put briefly, I work in a terminal all day. Sometimes locally, but oftentimes I ssh to a machine in the cloud.
Virtually any machine would work well for me. I do like nice machines still, but I would give up a lot just to have a nice keyboard.
To be clear I also have an MBP, but I usually use the junker. The MBP gets used for potatoshop and client side testing.
I also drive a '95 golf. Cost next to nothing to buy, parts laughably cheap. £500 for a convertible that goes like stink? Yes please. I could buy any car I wanted - but I prefer something cheap that I don't care too much about, that I can readily service myself.
Also, it's far more environmentally friendly to use old stuff 'til it dies than to buy new stuff.
Old doesn't mean bad - just old.
Guess we're soul-mates now.
Re: theft, encrypted CF card, selinux, good passwords etc., and I rsync home dir over ssh nightly when I'm using it.