I've been wearing Cool Water by Davidoff lately. Smells good.
Also Aqcua Di Gio is good. Both not musky.

If you wear a suit and tie to work, nothing wrong w/ wearing cologne, again as previously mentioned don't overdo it. One or two sprays are enough.
If you dress casually (i.e jeans and t-shirt) wearing cologne is a little tacky, again the scent is something dressy and formal it clashes if you're dressed in a t-shirt and jeans.
After hours going out on the town is the ideal time to wear cologne. You may want to respray if your going out after work.