You are not going to have trouble converting to any of the C150, AA5 or the Tomahawk from the PA28, although the AA5 is probably the closest to the PA28 in terms of ergonomics and handling, and the C150 and PA38 pretty similar in terms of magnitude of differences.
The Tomahawk doesn't have "aggressive" stall characteristics - it has plenty of warning, a good solid back stick force to stall it - it just tends to drop a wing and make you do the recovery right. More that the PA28 has incredibly benign stalling characteristics.
With 150 hours, presumably over less than 4 years, and hopefully a willingness to spend an evening with the manual before you fly any new aeroplane, you'll not have a problem.
G