I would go for a Sony Optiarc AD-7260/AD-7261/AD-7263 (they are amongst the cheapest and yet amongst the best) ... or a 'true' LiteON drive such as iHAS524 A or iHAS624 B (or one of their ASUS clones: DRW-24B1ST / DRW-24B1LT or DRW-24B3ST / DRW-24B3LT).
Sony Optiarc AD-7240/AD-7241/AD-7243 are also good drives ... but the AD-726x drives are equally cheap and newer so I would buy one of those instead. Most other LiteON iHAS124/224/324/424 drive models currently on the market will most likely be Sony Optiarc AD-724x clones (based on a NEC chipset), rather than true LiteON drives (which use Mediatek chipsets).
The advantage of a true LiteOn drive (based on Mediatek chipsets) is that they are excellent burn quality scanners as well, so you could use them to check your CD/DVD burns as well as writing CDs & DVDs...
I would avoid Pioneer DVDRW drives (because they are QSI clones rather than true Pioneers), LG drives or (even worse) Samsung drives.