For a small scale colo, I don't think I would neccessarily recommend a Level(3) data center, in most cases. We researched Leve(3) extensively, we were actually looking to take a few hundred sqft of cage space, or several cabs but had major issues with the fact that most of their facilities are not manned 24x7, they provided no complimentary remote hands (every touch would be billable - including reboots) - and the particular facility we looked had no crash carts available for use, and they refused to allow us to place one their d/c.
As a small scale customer, I believe you would actually be colocating with one of their larger colocation customers at that location. Given this, it's likely that your experience and service levels available will differ greatly on a location by location basis, as it's possible that some companies they've partnered with for per U colocation will have an on-site 24x7 presense, or would be able to provide you with a cost effective remote reboot / KVM-over-IP solution.
However, for the price you'd be paying, you could very easily find a more flexible provider offering a more redundant solution. While L(3) has a pretty good network, they have had there share of issues and it would be unwise to run them in a single-homed configuration, particularly at the price points above.
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colo.com purely resells L3 products, they don't add anything to it (service-wise). You will need to take care of all support yourself. There are plenty of other L3 resellers that actually have techs available to provide support in addition to Level3's techs.