Art morrison makes a nice rollcage for our cars for less than 300. Mine was 325 I believe for a full roll cage and I do drive it on the street. You aren't going to whack your head if you put the foam on it and your airbags work. It does stiffen up your car alot but probably not as much a sway bars.
2001 sangria zx3, best 1/4 time 15.70 @ 85mph. Now have an 04' Pontiac GTO w/LS1