I have been a sysadmin at various large (top 100) sites on the net for 4 years now. Besides excite.com who runs their own data center, the other sites have been hosted at Frontier Globalcenter and Level 3. Both are a power, rack, and AC setup. You provide the boxes and you provide the sysadmin expertise. Both have been very reliable with small amounts of downtime usually related to a screwup somewhere else on the 'net. I also know some sits who run off Abovenet who have good luck with them. I don't work for any of these companies, just a reasonably satisfied customer.
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I have been a sysadmin at various large (top 100) sites on the net for 4 years now. Besides excite.com who runs their own data center, the other sites have been hosted at Frontier Globalcenter and Level 3. Both are a power, rack, and AC setup. You provide the boxes and you provide the sysadmin expertise. Both have been very reliable with small amounts of downtime usually related to a screwup somewhere else on the 'net. I also know some sits who run off Abovenet who have good luck with them. I don't work for any of these companies, just a reasonably satisfied customer.