Cant comment on the two you listed but I have used JaguarPC (US Texas). They were ok but the bulk reseller servers were a little slow especially ftp'ing files.
I've been using Dotable (US West coast) for a few months and so far its been pretty good. I also use DigitallyJustified.com (Canada Vancouver) and they are also pretty good with minimal issues. They Dotable/DJ are not the cheapest but at least this allows them to not be as oversold as others. Which = better server perforamance and happier customers.
+ NOW WE'RE MAKING RECORDS, NOW WE'RE MAKING TAPES