Only Porygon I have is the DW one, I haven't gone about breeding those yet. Just realized, however, triviawise, that Porygon-Z is the only three-chain evolution Pokémon you can have at Lv.1. Cool. :D
I have a full Pokédex, so I will not be concerned with anything much in return. If you have any DW Pokés they might be nice, but otherwise, I won't be fussy. :)