Well you can always look at reviews here on WHT. Are there any companies you are considering? What kind of space/bandwidth on what budget are you looking for? Are you looking for a reseller that provides a billing system or any other special software? With some more basic information someone here should be able to help.
I recommend Hostdime. If you don't need phone support and your budget is low when try Surpasshosting(it's member of Hostdime family). Their support is fast and friendly. Uptime of the servers are good. Their plan features are rich and the prices are affordable. They have their own data center, too. We have a lot of reseller accounts on both of them for years and their services are stable and great.
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There are thousands. Check the offers section. There are so many offering almost anything you can want.
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