One month after we parked our machine at above.net, our Sun reliably came crashing down. Within about 30 seconds, we got email from above.net's monitors complaining that our machine wasn't pingable. It wasn't until two minutes later that my Uptime service started complaining . We were able to telnet in and use above.net's remote console facility to get the machine back up. We were able to schedule a visit by Sun service to come into above.net's facility and replace another big pile of hardware.
Prices vary depending on rack space and bandwidth consumed.
Exodus has a very good network and, if you have the money to pay them, offers a broader range of services than above.net. For example, Exodus will set up a firewall for you, help with Unix and Oracle administration, things that simply aren't part of above.net's business. As far as I can tell, above.net has automated more of their procedures, e.g., power cycling. That makes that they can charge lower prices and still make a profit. It also gives me confidence that their service won't degrade as they expand and hire new people.