I have 6-7 domain names that I have thought of and I'm planning to buy it in bulk so that I can save. Or am I wrong on this?

In my case, since its my first time to this hosting/domain registration, I only knew of GoDaddy with regards to domain registration.

Questions:

1. Will I lose out if I chose a cheap domain registrar compared to one that's popular?
2. For a newbie like me, what companies can you recommend for me to register domain names in bulk for cheap or affordable price?
3. I notice that some prices are higher because they offer support and customer service? Aren't those servers not reliable at all?
4. I've heard of some domain registrars that they're increasing their prices every renewal? Is that just natural in a business sense for these domain registrars?

Before posting this, I've been reading about NameCheap.com, and I'm considering registering for them unless you have other good choices to give me.

I'll appreciate every suggestion or advice you can give.