My problem with leasing Comcast's modem is that it's $9.80 a month. The Linksys modem I ordered (which got universally good reviews) was $64.99 on Amazon. If my modem lasts longer than 7 months, and there's really no reason why it shouldn't, I actually save money.
For the router, what works best for playing online games (mainly on Wii/DS, but I also plan on getting a PS3 this year)? Most routers do the trick surfing the internet. I bought my mom a Linksys Rangeplus doodad router last year because she said she didn't care about the brand, she just wanted wireless internet. It works and my brother doesn't seem to have too much trouble playing 360 online. I'm just trying to settle on the best router.
Thanks for all the suggestions so far!