GS 150 is a nice bike and issues are very small and exist in almost every brand... people change rear tyre in paiggio, deluxe, GS any ways...
other then that all are pak assembled so little problems are faced in start then no problem. even without disc brake if you are not a heavy dragger and cruise like a good boy you will ever hardly need a disc then why bother.
Han CG-Deluxe and Vicky Paiggio
believe me Sir if you are a humble or even moderate rider you would never feel bad tyre or bad brakes ... it is only felt when you really go for high end speeds.
so GS would be best bet as paiggios are scarce in KHI and CG are vulnerable so ur left with GS
hope it helps;