Okay. With that budget I would look for new Tokico Blues or the like, and get a set of springs that give a larger drop in front, like H&R's, etc. Buying used springs is usually fine, but I wouldn't buy used shocks unless you are positive they haven't been beat on or have a ton of miles. Another nice thing with Yellows is they have a lifetime warranty so if one ever goes bad, free replacement. But doesn't sound like those are in the budget. Or like I said, gently used coilovers.
Keep your eyes on CL, Ebay, forums, etc...never know what may pop up.