You do not price stainless-wrapped front brake line.
Nor do you cost your replacement master cylinder, if you insist on going for a dual-piston caliper. You will not enjoy the advantage of a dual-piston caliper without a corresponding master cylinder.
As to Tusk quality; I can't say--as mentioned, my riding partner only has 85,000 miles on his '08; no idea how durable the Tusk kit might be. My partner says the Tusk kit is superior to both EBC and Galfer in wear and performance.
He has CL brake pads; they cost more than the $ 10 you budget, but . . . they do not wear the rotor excessively, as do some pads (like the OEM ones).
All this said, by all means upgrade your brakes in accordance with your own preferences and budget!
Here's a Galfer oversize brake rotor, caliper bracket, and steel-wrapped front brake line on a Generation 1:
(MaY be an EBC rotor, ain't sure.)
With decent pads, I find the arrangement adequate for my riding environment and style; YMMV!