I guess I only have one Seiko that qualifies for the beater category:

Picked up this SKX173 last year from a fellow forum member, and it's seen a fair share of action as you can tell, but it's got great lume and is very accurate.
I've got a new crystal and bezel insert for it, but if I replace those parts, Im sure I'll have a case of the "Aurelius-syndrome" - all of a sudden it'll be too nice to be a beater.
I think my favorite daily-wearer for normal tasks would be the SBCM023:

Light on the wrist and wears well due to its smaller size, super-accurate, perpetual calender, decent lume and water-resistance. Goes well with almost any outfit.
What could be better?
If I need something for really dirty and/or tough jobs, I'll go for one of my G-Shocks like the G-7900 for instance:

Relatively cheap, always ready, virtually indestructable, and great timing features on top of that.