the choices available right now are basically cryonics or rotting.

I don't think this true; and I enumerated some other choices in my reply to lsparrish, below. There are traditional life-extension technologies (Alzheimer's cure, cancer cure, etc.), there are transplants (and stem cell research to produce them), then of course there's the good old Singularity. There are also other ways to spend your money, period. For example, if it is the case (hypothetically speaking) that all of these life extension solutions have a very low expected utility, you might as well forget about it and spend your money on something that will make what little time you have left a little more pleasant (which includes things like donations to charity).