Hi Saeroner,
As with Roastquake, your link did not work for me either.
That being said, there are a lot of options out there for great brewing kits.
Personally, I recommend starting at a Local Home Brew Store (LHBS) near you. It's always good to support the local economy, and the shop owner will be a great resource to ask questions and point you in the right direction. Oftentimes, unless you get free shipping, the local store prices are quite comparable to online vendors. I would simply google a local store near you (or, if you post where you live, I'm sure you'll get plenty of recommendations).
If there isn't a LHBS near you, you can always go to one of the larger online retailers. Personally, I tend to shop from Midwest Supplies (
http://www.midwestsupplies.com/). However, there are lots of options. Other popular options include (but are NOT limited to) Northern Brewer (
www.northernbrewer.com/‎), MoreBeer (
www.morebeer.com/‎) and Austin Homebrew (
www.austinhomebrew.com/‎) Some of those shops offer free or reduced rate shipping on larger orders, which a beginners kit is likely to qualify for.
As Roastquake noted, you may wish to get a pot larger than 5 gallons for a full boil. 7.5 to 10 gallon pots tend to be the norm. However, don't be afraid of using a smaller pot and smaller boils on your first few brews. I ALWAYS advocate that you should try the hobby first before investing a ton of $$ into new equipment. If you have a 3 or 4 gallon stainless steel pot at home, you're good to go.
You asked if those would work on your electric stovetop .. . the answer is a hearty "it depends" . . . if you have a top of the line, high energy stove top, yes, they will work. If you're brewing on a lower grade electric stovetop (as most of us here own), you'll want to look into getting a different option for your brew IF you want to do full (6-8 gallon) boils. My personal preference runs to the good old Turkey Fryer. You can pick up a decent turkey fryer at Home Depot (or similar) store for under $50, and they usually come with a nice Aluminum Pot. Now, there are lots of opinions on here regarding the use of aluminum pots, and I'm not here to start a war (it'll happen anyhow) . .. but my view is, if you use it for NOTHING BUT BREWING BEER, and you keep it clean, with a proper oxide layer (many posts here to tell you how to do that . . . I generally advocate boiling water in a full pot for an hour), you're fine brewing in aluminum.
If you have other questions, feel free to come back. Welcome to the hobby!