I buy standard frames from IKEA (I forget which model – I like the simple metal versions). They are fairly cheap, quite well made and are easily reusable. I generally buy the 15.75 x 19.75 inch silver versions. They are also available in white and black. They look very good IMO. This is also a convenient size for standard mat boards of 40 x 32.
This size is ideal for my standard sized print of 9.66 x 14 (I fill an 11 x 14 sheet of paper with a full negative). The approx. 3-inch borders of the overmat look very good.
These frames come with standard glass which works well, and effective clip systems.
The next size down works well with a 7.5 x 11 inch print (1/2 of an 11 x 14 piece of paper, much better than 8 x 10).
I dry mount the prints myself (I have a big press that I got cheaply from a school that was closing its darkroom). I also have a Logan mat cutter that works really well.
I started doing this because I wanted to cheaply get pictures on the wall – and not just in a bottom drawer somewhere. I also occasionally give matted and framed prints as gifts – they seem to be appreciated, and they don’t cost much.