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There wont be a larger DVD discs, probably ever. This is because existing recordable DVD formats don't support dual layer usage, which allows studios to stick 2x as much data on DVD than what you can burn to DVD.
But if you're referring to next generation blue-laser DVD technology, you have to wait probably two years before it picks up really. One Blu-Ray disc can contain appx. 27GB per side, but those discs wont be compatible with DVD drives and players we have nowadays.
For existing formats, there are three formats currently (and their respective subsets):
DVD-R (DVD-RW):
This is supported by Apple and most of the drives you see are manufactured by Pioneer -- latest model is Pioneer DVR-A04 and you should be able to find older A03 for relatively cheap price right now, since Pioneer released their A04 very recently and retailers need to clear their stocks and sell the rest of the A03s. A04 sells for appx $450 right now.
Positive side in this format is that discs are extremely cheap, less than $2 a piece for DVD-R media in U.S. And obviously DVD-R discs work nicely in most of the DVD players.
DVD+RW (DVD+R):
Mostly supported by Philips and HP. Discs cost more than DVD-R discs, but are rewritable -- the DVD+R format/subset which was recently introduced, is write-once which HP hopes will push the blank media prices down (also, DVD-R camp has their rewritable format called DVD-RW). Discs are supported by most DVD players.
DVD-RAM:
Not compatible with anything -- DVD-RAM discs can't be even read with regular DVD players or DVD-ROM drives. Useless, originally meant to be a floppy replacement, but luckily the whole format is dying.
DVD-R(W) drives can read DVD+R(W) discs and vice versa, but can't write to other format's discs.
(so, I don't hand out opinions about drives, just the basic facts :-)
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