Reseller Accounts are the perfect solution for resellers. The features and functions that are included with reseller accounts allow you to create seperate web hosting accounts, with individual logins etc.
99% Uptime Garuntee - I think this says enough regaurding the uptime
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ttp://www.eukhost.com/reseller-hosting.php
http://www.eukhost.com/vps-hosting.php
VPS is very much like a dedicated environment, where you will have your own root access and the ability to have your own Apache/PHP/MySQL configuration.
Feel free to chat to a representitive over live chat if you are unsure of which package you should have