So, we've been putting up with an old computer I bought 5 years ago for something like $200, used.
Our phone is hooked up to our internet (Magic Jack--I recommend it if your internet and computer are reliable--it's super cheap, and gives you free long distance). The old computer meant we weren't just having problems with the internet moving quickly--we were also having problems with the phone.
So I finally caved in and updated. I bought a Dell Vostro (it's the same line as my laptop) with a new monitor (the old monitor was super bulky and quite small). And I can now confidently say the following:
The problems we were having with our phone were not related to the phone itself, the internet, or the Magic Jack--they resulted from the old, slow computer.
The slow internet was not due to our internet provider (Current, which I recommend if you happen to be in their range). It was due to the slow computer.
8 USB ports are better than 2.
It's not by any means a high-end computer, but I'm very happy with how fast it is. And I figure that, when it comes down to it, it's cheaper than getting a one-year $40/month cell phone plan.