It all really depends on several factors; maintenance of the engine, how well it is tuned, how hard its run, etc. Some people have run it for years at 5-7psi and not had any problems. Others have blown their motors within a year, so you never know. But if you have a stock block, with correct tuning, 5-7psi should be fine, just make sure you've done your research.

95 GS-turbo: SOLD
92 Laser AWD- has a lot done, needs a lot more...
88 Suzuki Samurai- Daily beater/mudder