The Knot and Wedding Wire are easy search engines that often have basic pricing listed on each venue so you can get an idea and narrow your list. I also remember the Renaissance being "reasonable" in cost.

When we planned our wedding we went with the Marriott in Short Pump off Dominion Rd and had a great experience. I wanted an indoor venue in case of weather and it so happened Hurricane Matthew came through so it was a good call. I am going off memory but I think for our 80-ish guests it was $12-13k for the hotel package which included food, a basic bar, and all the infrastructure setup (tables, tableware, servers, etc) and that did include the 20% service fee and taxes.