Just got a Dell and want to add a Tv tuner but am so confused

Got a new Dell and want to add a Tv tuner. I have been looking around on newegg.com and other places and am confused on what I need. Currently I do not have HDTV all I have is regular cable but who knows if I will get it down the road and would like to have my computer ready for the future. What I want out of it is to just record TV.

Here is my computer. Vostro 200 Mini Tower
Intel® Pentium® Dual-Core Processor E2140 (1.60GHz, 1MB L2 Cache
Vista Home premium
Dell 20 inch Widescreen 2007WFP UltraSharp™ Digital Flat Panel
2GB Dual Channel DDR2 SDRAM 667MHz - 2DIMMs
320GB Serial ATA Hard Drive (7200RPM) w/DataBurst Cache
256MB NVIDIA GeForce 8600GT 2DVI
integrated sound card

If you could let me know what some good cards are that would be awesome or even if you could point me in the right direction

Thanks

Vostro 200 Mini Tower

Is that one of the smaller towers. I thought about getting one to save room on my desk but i thought it would be better to have a bigger one If i ever wanted to change something. According to DHL my computer is only 15mins from my house an hour ago. So if you know anything about good tv tuner cards that would be awesome.

$49? for a tuner card where do you get that price from all the ones i have found are like 80