SIGarmed: You can buy a used FA 83 for around $1,000 if you shop around the internet a little and (in my experience) most of them haven't been shot much. Not saying that is cheap, but if you can swing it, worth the extra $ IMHO.
Of the other 2, I would pick the Ruger...no experience to back it up, just don't trust a Taurus to hold up to the pounding, and figure a Ruger will hold its resale value better.
Porting is a mixed bag...my 454 is and it works for my style, but it makes an already loud gun louder (leads up with cast bullets?) and quite a few experienced handgunners don't like it.
FWIW, dvnv