Alot of guys dislike the e cam, throw around alot of talk about how dated it is, while it's a custom cam which i prefer, the e is still pretty decent, it's good with superchargers, sounds nice, passes emission and is usually dirt cheap.
I think your 450rwhp goal without an SC is going to be tough though.
Me personally i'd say forgo the nitrous setup since you don't go to the track, spend the money having the heads mildly reworked and get a custom cam.
I had a 100 shot back in the day and for the most part on a car driven on the street it was completely worthless and costly.
With an e cam, unworked heads you should be in the 300-310rwhp range, that would mean you need at least a 200 shot to get your 450rwhp goal.
If i remember correctly my 100 shot only produced about 70rwhp on the dyno.
As for the rockers, if you go with a custom cam, you can use either set.