ssh to my computer behind NAT

[Hiisi]

Dear list!
I would like to be able to ssh to my home computer located behind my
ISP' NAT. I know, I can tunnel to it through some middle host and
actually I'm doing it at the moment. But I'm fancy is there a better
solution? Is there a possibility of not using any computer at the
middle to connect to my home system from the outside world? Can I
connect to it directly using some magic setup? Any thoughts?
-- 
Hiisi.
Registered Linux User #487982. Be counted at: http://counter.li.org/
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Spandex is a privilege, not a right.