depends on what you want, reackspace does not do colocation, they do dedicated servers though, but I so did not like dealing with them on the phone.....
I would recommend valueweb, they are a very large hosting company with great priceing, the only thing is they do not support backups, so you would have to download it to either anouther pc at home/work or buy anouther dedicated server and have it running as a backup or something to that extent...
http://www.valueweb.com/dedicated/dedicated-hosting.htm