At this stage, you just have to consider where you are with your channel, how much time you want to or can reasonably put into it, and base any decisions regarding equipment purchases on that.
I can't remember the name of the mic, but Blue make a smaller, cheaper and quite high quality desk mic with similar styling to the snowball. Around £30 I thnk (and you can buy them in lime green - eeeee! Just like my old Ibanez guitar! Oh, the memories!)
What I'd say is, while you're starting out and getting comfortable, now is not the time to go overboard and spend loads of money on kit. A good mic is proably the first thing you want to look into getting hold of, though. Headset mics are hit and miss, and there isn't a DSLR in the world with a pro quality mic on board. If in doubt, search within Youtube itself for product reviews. You can learn a lot from them.
For pop shields, it's generally considered that one is as good as the next. But don't cheap out - under a tenner, you'll probably get a crappy gooseneck mount, and that's the most important part of the unit. Wider shields are a good thing, too, especially if they're double layered. That said, mine is standard size and single layered, and it does just fine.
And I wouldn't touch that package in the Amazon link with a barge pole. Mic, mount and flexible arm all for that price? It's bound to be awful quality.
