I have the 70-210mm f/3.5-4.5 USM mentioned in the article and it is pretty incredible how good the lens is for what you pay. I bought it for I think about $100-120. As much as I love the shots I have taken with a 70-200 2.8L, in most cases when compared side by side with the 70-210mm you wouldn't be able to pick out which photo was taken with which lens. Realistically for me the biggest difference shooting with the 70-200mm 2.8L made was that the photos were perfect right out of the camera which saved time in post processing. Obviously the price savings is a huge advantage over the L's but equally attractive to me was the fact that it is nearly 1/3 the weight, and much more compact than the L. It really is a much better experience to just carry around and take photos casually. I use it on a 5D classic, and I love it. Highly recommended.
Another one of my favorite budget performers, and I think a perfect pair with the 70-210mm lens is the 24-85mm f/3.5-4.5 USM. I have the champagne (a.k.a. silver / goldfinger) edition of this lens and it is very sharp, fast focusing, FTM, and like the 70-210mm, super light weight and compact which is a huge plus compared to the similar focal length L zooms.
If you have any specific questions feel free to ask and I'll try my best to answer from the experience I have with these lenses.