I've had pretty good luck with Sonic's DVDIT! (PE). It'll do 16:9, and encode to Dolby Digital (1.0 or 2.0) and accept AC3 files if you have an encoder that can generate 'em.
Pinnacle Impression is very versitile, but you have to make your own menus, buttons, etc on something like Adobe (or other .bmp capable paint program). For a full-blown package, I'm sure it's a great way to go (I don't need that capability right now).
MyDVD is not too bad (especially considering it's under US$100.00). The trade-off is always going to be versatility versus simplicity / ease of use. MyDVD is very easy to use, but doesn't have a lot of options. Any problems with playability I've had with MyDVD were the same problems I had in the other packages ...I believe it's more of an encoder issue or media issue (some of the cheap DVD-Rs don't work worth a damn) than the DVD authoring package.
Figure out what you need in the way of features, the level of "Ease of Use," and price ...then go looking. You can spend anywhere from US$ 79.00 to $2000.00+ on DVD authoring packages.
Good Luck
Scott