s/c will give you the power, keep the fuel mileage and it wont be too much for the street. by the time you head/cam and do all the other mods you will easily pass the cost of s/c. and you'll be getting a lot less fuel mileage
ok then thats half the battle. if you order all the stuff from brenspeed they will make you a tune for free... unless they changed up how they do things. usually its buy parts - get a tune.
i say def go with comp. they have a few different options without having to change valve springs. i have the thumprs, big noise, not big power. picked up 30rwhp and they are for high rpms.
hotter spark, better burn = more power... if you get to wild with n/a it wont be practical for DD use. s/c would be the best way to keep it mild with enuff power and safe for DD