Buy 10 SP30 miners. When you make your first 25k then put them back into your pocket, next 25k reinvest into mining. I would advise you to exchange BTC only when new and better mining equipment comes out or when BTC reaches at least 1000$.
I was thinking about mining too,since bitcoinis on the wave ,better to mine it than buy it.But what about the electricity consume and the space?I have an small apartment ,so not to much free space,plus i am thinking that i need an extra AC too?
Mining is great fun and highly addictive. However, if profit is your motive you'll definitely want to look into investing into anything but mining. Hardware value depreciation in the asic and scrypt asic markets are absolutely insane right now (and have been since I started mining). Factor into this how quickly difficulty is increasing, a small apartment with limited electricity supply and you have yourself a recipe for disappointment.
Also, odds are you won't really be able to host any kind of serious mining equipment on a typical apartments wiring. If your space, electricity, and cooling are limited, consider cloud mining instead. Although you'll run into the same issue(s) of depreciation of whatever you buy soon enough. Hope this helps.
