To my (completely non-expert) mind if you're going to go for a "low intensity" aircraft it might make more sense to use an armed version of what you're already training with to minimize the training delta for your pilots (and maintainers?).
Question...is it likely that the RCAF will eventually shift it's advanced jet training aircraft for our F-35 pilots from the Hawk to the winner of the USAF's Next-Gen T-X Trainer program?
If the Lockheed Martin / Kai T-50 (http://en.wikipedia.org/wiki/KAI_T-50_Golden_Eagle) ends up winning that competition then the FA-50 version (which is already in use in South Korea) might make sense. It's supersonic, can extend it's range with external fuel tanks, supports AESA radars, Sniper targeting pods, and can be equipped with a variety of advanced Air-to-Air and Air-to-Ground guided weapons.
On the lower end of the price/capability scale you could go for the armed version of the Harvard II...the AT-6 (https://www.beechcraft.com/defense/at-6/). This could allow pilots that don't/haven't made it (yet) to the limited F-35 slots to possibly train and learn some of the skill sets earlier that will be eventually required when they move up to the F-35. Would this kind of aircraft maybe even be something that would be possible for Reserve pilots/techs to use and support in or around one or two major urban centres?
As for the YAK-130, I can't imagine any situation where Canada would purchase Russian military aircraft in the current political climate. Just doesn't make any sense.