I'll add another "I concur" with chas0039's comments.
Although the costs of actual dvd burners has fallen to a very reasonable level, the main "expense" (aside from media cost) will be in the intangible data quality level for your burns. Go cheap media, and roll the dice. Go high quality media, and you improve your chances for long term storage.
But ... as chas0039 mentioned ... all burners have very different media 'preferences' as that relates to the 'quality' of the burn.
As suggested, it's worth it to spend some time reading the forums (dvd main, specific brand forums, and media forums as well) to get an idea of where you're headed.
IMO, it starts with your media targets ... that will be a HUGE factor on deciding (and having others chime in with their opinions) your best bet for a burner. There is no BEST burner, per say, but there are certain burners that handle certain media better than others, etc.
I know I just created more work for you ... but, it'll be worth it in the end ... when you consider what your DATA burned is "worth".