I'd think that you'd want around 10 Ths (10 000 Ghs) to make it worthwhile. also you'd probably want to add a THs every month or so.
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I wouldn't even bother solo with this hashrate only 20+ if not more.
Right! And he'll only need 10,000 of those 2GHs Block Erupters to get to 20THs. Sounds like a great plan!
Silly, not the old block erupters. Maybe the new ones when the're done:
https://github.com/blockerupterI was talking about the new Gen3 AsicMiner Chips:
https://bitcointalk.org/index.php?topic=438359.0Rockminer is using the new chips:
http://www.rockminer.com/ , Good price too, 4 BTC for 2.6 THs = about $1.08/GH @ $700usb/BTC

, but 1.2W/Ghs

Shipping starts June 25th.. that's pretty good too