I've only seen a few good suggestions, and that's from people who invest. Many others haven't invested in real estate but are shouting advice like they know all. It's funny.
Instead of asking advice on GFY, try another board geared to, gee I dunno, real estate. Here are a couple good ones:
http://www.creonline.com/
http://www.mrlandlord.com/
Enjoy.