Magnus IMO are the best place to start to learn sharpening, they have an excellent grind and take little effort to sharpen. We have 6 packs starting at $20.99 so a great value too. We also have some Magnus 4 blades on clearance for $19 shipped in the sponsor's classifieds. We also have the Magnus screw in heads, the 140 2 blade already has adapters installed and is an excellent head at $23.99 per 6.
STOS are the same way, great heads but a bit more pricey.
Most traditional style heads are very good heads, but some take more effort than others to sharpen. Zwickey, Grizzly and Eclipse are all outstanding heads in there own right but take more skill to sharpen than Magnus.
Good hunting whatever you choose, get them sharp and flying straight, put them where they belong and you'll be grilling!