For $30 billion I would rather have some power-projection like an Iwo Jima or Tarawa class light carrier/MEU transport with a compliment of a second-hand (and retired so DIRT cheap) used harriers or cobras mixed with our existing transport choppers. The would could transport, land and support our recognized world-class infantry in a self-contained battalion-strength (~3000) force to trouble spots. It would allow us the capability to intervene in small peacekeeping or CDN-citizen-extraction situations without begging and borrowing (and securing the permission and assistance) of the USA.
Failing that, if we MUST buy fighter jets (because we are convinced that we are not "sovereign" enough without first-rate home-airspace shoot-down capability) then I don't see any reason why we need 5th-gen stealth fighter-bombers... Saudi Arabia just completed a military purchase from the US buying out massive quantities of 4th-gen fighters, tanks and choppers for disposal-cheap prices because the US treats its 4th gen stuff as "surplus."
By 4th Gen we are talking F-15 strike eagles, F-16 falcons, F-18 hornets (modern "E" type), apache and cobra fast-attacks, blackhawks in transport and gunship configuration + full modern ground units like the Bradley IFVs and Abrams tanks... basically all the ridiculously over-capable hardware that turns US/NATO soldiers into literal Gods of War against any realistically conceivable enemy.
If any enemy of Canada ever has sufficient technology and capability to punch his bombers past last-gen F-15 Eagles in interceptor setup he is going to be waaaay out of our league to take on alone, and whether or not the more expensive F-35's take more of the enemy planes with them will not change that such an enemy WILL put ordinance on our soil... or the fact that at that point we will have to hide behind NATOs skirts anyway.
Red Dawn fantasy aside, an F-15 is just as good (if not better - its significantly faster) for spanking an arctic spy plane or cutting down a hijacked airliner or suitably intimidating a leaky rust bucket full of illegal migrants as an F-35 - and at probably less than half the cost.
I'm 110% for a usefully strong and capable military but we should be more intelligent and realistic about it.
Mr. Harper - Flying F-35s will I suppose add at least a full inch to the national penis... but against the 10-inch monster schlong of the F-22 (Not for Export) what is the point of competing even if you care?