Regarding the DAL 55-300:
1) Lack of hood: A hood identical to the original DA hood is
$3 on eBay.
2) Lack of quickshift: Press the lens release button and you can turn the focus ring. The lens won't come off by itself, so don't worry. I've done this many many many many times with no problems. No biggie.
3) Plastic lens mount: Very unlikely to break unless you drop it on a hard surface or bang on it. If you do either of those things, your lens is probably going to be hosed anyway.
I personally would go for the DAL & save the $100. (well, $97 after you buy a hood) But yeah, either version of the 55-300 is a superb choice.