Click this link for a list of rentals in Summerville in your price range;
Let me know if you see something you like.
If your move-in goal is June, then starting to look mid-April would be a good timeline.
Search direclty on my site: http://www.blogcharlestonsc.com
Take a look at some of the available listings here on Trulia: http://www.trulia.com/for_rent/Summerville,SC/SINGLE-FAMILY_
Hope this helps!
ALI, Community Manager