Internet.bs is a spammers/fraudsters registrar. I wouldn't use them. Personally, I used to like GoDaddy best, and they're cheap with all the codes, but for me, their latest rollout of their Control Panel isn't intuitive at all. I've pretty much gone from loving it to hating it, overnight. Also personally, I think NameCheap's parent registrar eNom also has an excellent Control Panel, especially their Magic Folders. You can probably get a reseller account with one of their resellers in the $9.50 range. Also, I think NameSilo has a pretty good offering, providing everything for free, although I haven't used them much. But I personally use Dynadot. There was a bit of a learning curve for a few days, but it does everything and more of what I want, without the bloat of GoDaddy.
When you say you are going to buy a lot of domains soon, how much is a lot 100? 1000? 10000? If we know that we might be able to tailor our suggestions a bit. For example, Dynadot can give you $8.75 (+ $2 privacy, if wanted) if you spend only $500/year and $8.50 (+ free privacy) if you spend only $5000/year.
The beauty about GoDaddy is that everyone has heard of them and most already have an account there, making sales/pushes relatively painless.