Pioneer Plasma for Video + DVD + PC ?

I am still a little confused on 720 vs 1080 and plasma vs LCD and under what circumstances I need to use a scaling device.

I do know that I would like

1) a monitor without the cheapo speakers and amp
2) multiple inputs to use computer, cable box, DVD etc
3) in an ideal world, looks great with digital photos
4) for PC, will probably use an ordinary laptop with VGA cable

The device below seems attractively priced

http://www.plasmabay.com/plasma/Product.asp_X_Sku_Y_PDP427CMX

but I dont know if this will work well with my PC?

Or look miserable due to "scaling" issues?

I recently bought 3 Sony MFM monitors because they offer multiple inputs and look great as a computer monitor with 1500 x 1024 resolution or something.

However, they have cheapo amps and speakers and are only 19" in 4:3 and 20" in 16:9.

For PC, these were clearly superior to a Samsung "HD" LCD TV which apparently was a 720 device.

But then I read articles which say that 1080 device and 720 devices should be virtually indistinguishable unless you are seated very close, watching slow moving images etc.

Sorry I am still clueless. Any advice greatly appreciated. The guys at avsforum are way too smart and too technical to deal with my pathetic question.....

Thank you