Most home theatre enthusiasts will tell you that Monster cable is overpriced for the quality it gives. It's roughly at the same level as most companies, but sales people at various stores are pressured to sell them over others, and pressured to tell you that Monster is far and away the best product out there. Monster also enters into deals with stores so that they carry mainly Monster products, and so people can't even compare different brands. Next time you're at a store, ask if you can demo Monster cables and equivalent cables from another brand, just so you can see the difference. I can almost guarantee you they won't let you.
At any rate, whether component, S-video or HDMI, most of these companies have very similar-quality products. Just make sure the video cable has a nominal impedence of 75 Ohms and you should be fine with whatever you choose. I've got Acoustic Research component video cables for the DVD player going to my TV, and the video quality is superb.