I believe the stats for my old archer unit were:
The Golden Arrows
Archers 55 training, 75-4/85
A nice, cheap defensive unit with plenty of room to grow over time. Ended up taking on mixed groups of undead and monsters regularly without a worry, and took some shifting in real combat as well (for an archer unit anyway).. With a good captain and some training, they became pretty fearsome, plus they could do civil work at pretty amazing rates.
Good to know about the SF ranged unit usability. I think I was throwing out 580 odd hits with mine at 33 men, so they'll get a heap better as they gain a bit of experience. It was a pretty screwy first test-run, with infantry mucking up everything (I may have lost less if the infantry hadn't even been there), but I'm glad that they should get better. Would still love a range 5 unit one day, just so I can stand in the rear line and pepper away at them from turn 1 (or from the rearguard in a lot of massed battles).