Taking Restricted Gear for 2nd-hand ware is making a serious power now for power later sacrifice. Are you sure you want to do that? In the long run you would be much better off spending those 15 quality BP on Martial Arts, getting rating 2 secondhand Muscle Toner/Augmentation, and making your Wired Reflexes not alphaware.
You can do a lot better than the Praetorian. The mods it comes with are not actually that great - you would do better taking a higher-quality base gun and modding it to have a blade.
For example, Ruger Thunderbolt, Stock Accessory, and with 11 strength you get +2 RC for free, putting you at 5 which is what you need. You can attach a Flick Bayonet [Barrel Accessory], although it is 15R it isn't very expensive. Smartlinks are also accessories. Melee hardening is cheap and only one slot. As a result, you get a gun that is just as good in melee and significantly better at shooting people.
Clinch is a super bad manuever.
Multi-strike is not as awful as Clinch, but it's still pretty bad. Using Two-Weapon Style is almost always more helpful than splitting your pool for two melee attacks, and if you are hitting by a large margin, Called Shot is almost always better for offense anyways.
Finishing Blow, Riposte, and Full Offense are all more useful manuevers if you really want as many as possible.