Based on my experience I can tell you that investing in GPU mining is less profitable than investing directly in Bitcoin. If I had invested 4 months ago in Bitcoin instead of buying mining equipment I would have earned ten times more. Also, mining requires some attention and effort because you have to know what is the most profitable to mine and how to switch between coins (wallets, choosing pool, configuring miners etc). I would recommend you to invest in Bitcoin and slowly learn how it works by reading Bitcointalk and Bitcoin wiki.