Will I break anything

Ok, well I've been thinking about the future, and what kind of money I really plan on spening on my car, and what I want out of it. I've decided as of now that staying N/A is the way to go, I just don't really need all kinds of power that a turdbo or swap would give me, and I want absolute reliability. So I figured I'd go ahead and plan on finally getting a hotshot header, an SE-R throttle body, maybe some 11:1 pistons, the JWT ECU, and the cams, to compliment my exhaust, intake, and pulley, and just be done with it and enjoy what I have on the street and on the autox course (and the road course when I get my cage and harness). Inside engine work like port&polish, etc. are a possibility, but not for certain. So I guess my question is, do I risk breaking anything with these types of mods? Should I also look into reinforcing my engine just in case? I wouldn't think so since I won't be making all that much power, but I want to be sure so I can do what I must to retain the reliability. Also, for those of you who may have some experience in this area, have any wild guess on what kind of power I may make from the above mods?