I've used probably every major domain register under the sun, and I've always found them pretty much the same. Thing is, if you don't require hosting, or at least don't host with them there shouldn't really be any issues with any domain register that's considered trustworthy. Godaddy, and Namecheap have been leading the field for many years. I believe Namecheap allows Bitcoin payments, which is always a benefit.

You say your domains got suspended; Do you mean that they terminated your hosting package with them, or they suspended, and have taken away your domain? I don't think I've ever heard of the latter happening, but if its the former its probably due to you breaking their terms of service when it comes to their hosting services.