Wow, they only offer RH 8.0? Their upgrades are completely ridiculous (in my opinion). Even high-end dedicated providers don't charge that much. They're charging you full price for the cost of the upgrade component then billing you every month for it.
You can go to Webhostingtalk.com and perform a search on them, there are some opinions there from people who have actually used them. I'd say, read through them, shoot them an email with a few important questions and see how you feel after that.
I also agree with fishfreek and his comments as well.
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edited by QT_ for re-wording "upgrade" comment>