West? East? Or Central?

I am really not sure if the location is effecting to speed. I am chooing a provider for colo'ing few servers. I know each region has very good providers (in both services and network, from reviews on WHT), but
- from the west coast to central, the latency difference is around 30 - 40ms
- from the central to the east coast, the latency difference is around 30ms

so, if I go with a provider in west coast, it really saves me 60-70ms latency from my area. However, someone likes gnax in east coast using Route Science, that's advertised to help to get the better routes.

I dont see any in west coast using RS or FCP. So, should I go
- with a "normal" provider (I mean network without RS or FCP equipments) in west coast,
- or with a provider with RS/FCP in any place?

Is the location really effecting to performance?