Monitors
Try and look at it this way....(just my thots)
The best amplification system, along with the most extensive rack you can imagine, and top of the line equipment ain't worth diddly if you cut corners on where the sound is gonna be heard. Imagine your system or any other studio set-up for that matter. Now imagine listening to your work through the 6" oval speaker in your grandfathers buick. Sometimes ya gotta spend the extra few bucks. But hey..if you can get something worthwhile on ebay...go for it. Personally, I got burned once...so I don't do anything on ebay anymore.
Once again, Spinsterwun said it best.....
"There are certain corners you can not cut."