You should really look at your usable freq spectrum to see if there may be other users in the area.

I'd suggest the Shure SLX/SM58 system. You have a good choice of bands and 24 mhz of bandwidth within each. Good range and is the industry standard '58' mic capsule.

http://www.shure.com/idc/groups/public/documents/webcontent/us_pro_slxspecsheet.pdf

edit: Maybe out of your budget. PG series is a cheaper alternative. Either way, stick with the SM58.