This is primarily a customer-to-customer forum. You will get great answers to all your questions, but if you want definitive ones, you should contact Dreamhost pre-sales support through the following url:
I know for sure we have cURL. Others can chime in on the others...
BTW, all the packages have the same access to php.
What are [color=#CC0000]50DISK50[/color], [color=#CC0000]3DOM50[/color], and [color=#CC0000]1IP1DOM50[/color]?
They're Dreamhost coupons!