Home network through wireless broadband?

[321Mike]

I currently have 2 desktops and a phone (VoIP) connected by a router to cable internet. I'm planning to get a laptop soon and will use the Verizon wireless broadband. Now, I'm trying to figure out ways to save some money.

I'll get rid of the phone because Verizon requires I have a cell phone contract to get the wireless broadband. It will be my first cell phone - that's how behind the times I am. My real question is, can I get rid of the cable internet connection? I still want to be able to connect to the internet with my two home computers. Is there a way to connect them through my laptop? I'm well within the broadband coverage area for Verizon so I should have a pretty good connection, but will networking two computers on top of the laptop make it slow? And finally, are there any upgrades I need to make sure I get when I order the laptop? I'm probably going with the Dell 9300.