One correction: eligibility to nominate is not based on intent to attend the Worldcon in Toronto, but in having bought a membership (attending or supporting) before the deadline which was, I think, in January. (A membership bought now will still enable you to vote on the final ballot in July or thenabouts.)

Membership in last year's Worldcon, whether you attended or not, will also enable you to nominate for this year's Hugos, but by itself will not enable you to vote on the final ballot - you need to be a member this year to do that.

Nominate what you like, but I for one don't intend to write down a title I can't pronounce.