Seems a bit expensive considering you can pick up 95% of that stuff today for a lot less. The only thing you have going for you is the fact that 5830's have not been available for awhile. I might be wrong but the cost brand new for what you listed (excluding the 5830's) is ~$559. That means your charging around 185 per 5830 which is horrible. You'd be better off buying the 6870 (the exact same card that requires less power) for $150 right now and they are available.
I shouldve put part numbers and stuff. Total cost for each of the 5850 rigs was around 1050 and then i added on a little for shipping and for installing windows license and all the goodies there. The 5850 was around 1100 so same thing there. I was thinking $1 per mhash was reasonable...