From what I know, porting is kind of a waste of money if your doing a budget build. You can gain alot more power by investing what you would have paid for porting in your IC, turbo, or EFI.
From some of the stickies it seems like the cam will be fine up to the power goal you mentioned, but I cant give any exact numbers if your wanting to go aftermarket.
By itself the n42 with dish pistons and a turbo will be a little high on compression. Im not sure what is best, cheapest, but you might consider getting a p90, or even lower compression pistons?
All this is from what Ive read/researched and will be considering it in my build, so as Reading Rainbow said, "But dont take my word for it." Id go read and search some more.