When I got started, I picked up the equivalent of that Norther Brewer kit with Better Bottles... I've now got 1 pair of Better Bottles (6 and 5 gallon) and 1 pair of inherited glass carboys (6.5 and 5 gallon), the 5 gallon Better Bottle is usually used for carting around water on brew day, has seen beer in it 3 or 4 times out of 20-odd brews, and the 5 gallon glass has been used once. Might not be bad to have one around "just in case," but it's definitely not a necessity to get started. Also, when given the choice, I'll always use my Better Bottles - they're lighter and easier to handle, and I'm never worried they're going to crack or shatter and slice me open.
If you're trying to stick to a budget, I'd lean towards that MoreBeer option. If you're looking to get yourself equipped with an eye towards the future (you really don't have to secondary the vast majority of the time, but there are times where it's beneficial), go for the NB option with the plastic carboys!
But I'll throw another option out there, just to make things even more fun. Here's one from
Midwest Supplies:
Granted, it includes a bucket as a primary fermenter, so you don't get as much visibility into fermentation. But it's a 6.5 gallon bucket, so you have a little more head room, which means a little less liklihood of messy blowoffs than with that 6 gallon better bottle. Also, this kit, unlike the Northern Brewer one, actually includes a hydrometer - a crucial piece of equipment for every brewer. Granted, the kit doesn't come with a beer kit, but it's $60 cheaper - I think you can sneak in whatever kit you'd like (maybe 2!) and still have a few bucks to spare.