#2
Uhh. Well, I mean, it's not like there's a huge variety of Strats at that price. You can get a standard Mexican-made Strat for something like $500, or an HSS Strat for about the same. I would say an HSS Strat is good for punk and alternative so I'd recommend that.
#3
The HSS strat would be great for that you can get alot of different sounds out of it
#4
For punk i'd just get the standard, you dont want a humbucker on the bridge , you want MOAR TREBLE!
My Gear

Fender Deluxe Players Stratocaster
Marshall DSL 50 with 1960A