Burnham Radiators and Radiator Installers in Chicago

Hello,

I need to replace one of my radiators.  I've already posted about it looking for a repair man, but now thinking I need to just replace it.  I found a couple of places which sell used and new radiators.  My question is I am thinking of replacing my old cast iron 8 fin 3 pipe radiator with one of the NEW slim Burnham ones.  My reasoning is that those are cheaper than a new "Classic" Burnham, and it seems like it would be a bit lighter in weight to get up three flights of stairs.  Anyone have any experience with these?  Would it be a horrible mistake to switch out to one of these or should I look for a used "classic" style radiator?

Also I live in Chicago, does anyone know of a good plumber or steam heat company I can call to arrange for them to install it?

Thanks

Jon