In stock form boost stays at 5psi until 4500rpm then goes to 7psi, completely normal.
High boost solenoid mod is the first thing most people do. If you get a boost controller 10-11psi is as high as you can go before the ECU goes into rich and retard mode.
Word of advice, if you are on a budget just stick to the basic boltons. When you get to the point that you need to upgrade the ECU it starts to get costly.
Also have a clear idea what you want to do with the car BEFORE you start spending money, that way the path you take will become a little bit cheaper.