the costco c42hd18 has 1 less hdmi but is replaced with an svideo hookup under the front panel. the costco model is also a flat black whereas the px model has a glossy black. the glossy black is shiny like samsung's models, ps3's, ect. it looks much better. the flat black makes the tv not look as modern. that said, i have the costco model. you'll probably not miss the front hdmi input and the trim color is up to you. i have the c50hd18 and it being so big, i don't notice the trim much anyway.. given if both were the same price, i would buy the px.