I too am starting multiple accounts. I have one with Moniker (though they screwed up immediately and suspended my account since they hadn't yet given me a sales rep!) I spent an hour cleaning my cache repeatedly, trying different browsers, asking for my password (thought I was using the wrong one). All of this, only to get an email two days later telling me that they had restored my account and they had temporarily suspended alot of new users that day. I was very tempted to write and let them know I regged four more names in those two days (not alot of money from me, but still, it's the point).
GoDaddy tries to throw alot of extras at you, but if you make sure to click the continue or no thanks button, you're fine. Check your total before submitting the order. BTW they are running a special on .info at $ .99 apiece. I regged disappearing.info and plan to put up alot of valuable information about the extinction list for both plants and animals (to start).
I also use Bluehost as my hosting provider for my websites. They are pretty good, though they only do the top six extensions, and it's 10 bucks registration for any of them. Even if they can't reg exts like .mobi, they will still host them (that's what they told me and I said "well, I would imagine so, lol). Super fast support, and you can get help via phone, email or live help.
I'm going to try enom next. I agree with Len and Mowd-diversify. Better to be safe than sorry.