I agree you can paint/powder if you want but then trying to prove what brand the bike is at selling time can be difficult.
I am not familiar with Bridgestones but I don't think the 600 was an upperend model right? go for it.
The Moser? Not a very sought after bike but a good solid brand. If the finish if really bad go for it.
The Bianchi..... possibly early '90s, just a Columbus frame? A Columbus Bianchi for $200-300 is a good deal but perhaps before you ruin any value the bike/frame has perhaps you should find out what you really have. Is it a run of the mill late '80s frame with Formula tubing? Or maybe one of the nice early '90s SBX frames or even a somewhat sought after TSX or EL OS frame?
If you want anonymity for your bikes buy some of the converted fixies that already had their identity stolen. You might pay $200 for a Columbus SLX frame that is really Tange Infinity but who care it is anonymous.
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk