i believe stryker b and c fuses are the same. stock, rtf stryker c has a different motor mount, though, that covers the whole aft section that we'd normally tape/glass. i'd like to get one of the new mounts for my mega motor but the stock one is holding up just fine. the front ring i cut and bent the two pieces in (keeps the motor from sliding forward) and the rear ring i heated to spread open a little. two screws are the only other things holding the motor in. not too much is needed unless you're hitting the ground hard every few flights.
as for whether the c is worth it or not, i think so. the radio is on 72MHz and the rest of the gear is also standard (non-PZ proprietary) so swapping out parts is easy and affordable. i'm not up on current prices, but i paid $82 for my mega, $50 for the esc, $25 each for two HS-81MG servos, $50 for the receiver (electron 6) and $150 for the radio (optic 6): total- $382. That doesn't count one battery pack and charger which is also included in the rtf version. so, not too bad of a deal.
i read elsewhere that the mega beats the stock c for speed, but there's always a few variables to consider (prop, battery, etc). either way, it's hard to go back to brushed power after flying brushless.