If you're investing in monitors, you probably don't want to skimp on them, try save a little more. The reason being is you'll have to 'learn' them, the characteristics of their sound, etc and learning a set of lower quality speakers won't do your mixes any good and makes it much harder to get your mixes to translate to other systems.
..then there's room treatment which is a big one.
At least go for some 5" active nearfields monitors like Samson R5a's, Yamaha HS50's or KRK RP5's if you Can, don't hesitate to look at second hand items too.