We're laying out about $2600 for the rig, its pretty cool imho and there are other benefits, but I keep thinking there might be a smarter way. Among the other benefits are that I don't have to go through the capital control / tax issues of my country if I mine.
What have been your experiences of this if you are a long term miner? (buy vs mine (?) )
Put together a simple model with increasing difficulty, or use SgtSpike's pre-built spreadsheet. How long until you plan to break even?
Rising difficulty is really, really going to diminish your profits in short order. The only way around this is if the exchange rate goes up. Once you're banking on the exchange rate going up significantly, it might not make as much sense to invest in mining hardware rather than BTC.
For the record, I don't expect the exchange rate to keep going up.