I've got some nice lights (Surefires and an awesome elzetta), but I've moved over to streamlights for nearly everything now.
The polytac is a great light for the money. I carry it on my best at work and have a spare in my duty bag. I can usually find them for ~$35 shipped on Amazon.
At that price, I can afford to have two in my truck. I bought one of the right angle style ones recently - I don't like the construction quiet as much as the standard poly tax, but it's got a nice clip for hanging which could be nice for use as a work light.
If you're set on getting one nice light, I really really like my elzetta. I like it so much I don't carry it at work anymore because I'd hate to lose it. I dropped it down a storm drain while "dealing" with a guy. It was on, and stayed on under the 6ish inches of murky water while I pulled the grate to get it. It's (post-sanitiziation) now my nightstand light.