DVD burner for dimension 4100

What would be the best DVD-RW  to install in my PC?

I have a Dimension 4100 

P3 1GHz

40gb ultra ATA hard drive

512mb sdram

sony cd-rw

samsung dvd-rom

Geforce4 Ti4200 64mb 8x agp video card

Also which drive should I replace with the dvd burner?