You probably want a carrier neutral datacenter then, if you want to bring in your own fiber. CyrusOne in Chandler/Phoenix is state-of-the-art and lots of providers are building in there since it's a 1,000,000 sqr/ft complex.
There are a lot of managed service providers that work in-site to assist you with your racking/managing of servers.
█ Managed Service Provider - www.OpticIP.com
█ Public & Private Cloud Solutions | SSD SANs | High IOP's | CDN Solutions
█ Phoenix/Chandler AZ Colocation | 48U Cabinets | Data Halls | TIA-942 Tier 4 Facility
IO in Phoenix is nice because they don't charge monthly for cross connects, which is quite unique in the data center industry and great for building a nice BGP mix. They also include 24x7 simple remote hands, which is also not so common. The IO Phoenix One data center itself is a very impressive facility.
+1 for QTS Sacramento. I have been there for 8 years and its a great option to be close to all the San Jose peering yet outside the seismic risk of the Bay Area. Lower costs than Bay Area also is a great bonus. Their own BGP blend is somewhat expensive XO/tw that performs well, but it is ideal for backup. Cogent is definitely there and performs reasonably well. Our Centurylink/Qwest circuit has exceeded expectations. They don't currently have Level 3 on-net but rumored to be coming March 2014. Since QTS took over they appear more focused on larger enterprise business and have been spending money upgrading/remodeling what was already a very nice data center.