Los Angeles Colo With Large Bandwidth

I am working on finding a colo provider in Los Angeles that can meet these requirements:

* Full Cabinet

* 2x20A 220v Power

* Bandwidth either 1Gbps full burstable or 1Gbps dedicated (with plans to move up to 2-3Gbps within a year)

* Available ASAP

The sites that it will be hosting are sales and informational for a consumer product that sporadically gets news or magazine coverage which massively spikes its traffic. These times are when a good chunk of the revenue comes in but we do not necessarily know when they are coming. Does anyone know if having a full burstable line will cover this sort of eventuality or should we grab the entire dedicated line just to ensure we have it waiting? We would be providing all of our own firewalls and equipment, we just need the bandwidth, preferably without having to deal with a router on our side.

Price isn't the biggest consideration; reliability, stability, security, and performance are.

As an additional question, we are looking at a Catalyst 4507R-E switch for the core of our network, with redundant supervisors (for the purposes of ensuring we have no single points of failure). Any one have experience with this switch that can say whether it's a good choice or not for that?