What inputs do the philips and dell monitor have?
If they do not have a display-port input, then you may need to get an adaptor to vga/dvi (the dvi needs to be an "active" adaptor).
Philips monitor - 1 X VGA, 1 X DVI
Dell monitor - 1 X VGA, 1 X DVI (with HDCP)
I have heard that many people with Eyefinity are successfully running the setup using a DisplayPort---->VGA adapter. These adapters of course cost much less than the rip-off prices being charged by the "active" DP adapters. The downside of course is that 2 monitors will be fed thru DVI and the third thru VGA. But from what I hear its very hard to tell just by looking at the screen! So I shall have to look into this some more! :) Also - thanks for the link to those benchmarks...very interesting!
BTW heres the Dell Im looking at:
http://accessories.euro.dell.com/sna/productdetail.aspx?c=uk&l=en&s=dhs&cs=ukdhs1&sku=185311
Could try e-bay for the monitor model you already have.
Great tip! Unfortunately..beleive it or not its impossible to find this monitor even on there! Unless Ive been doing something wrong! Ive never used EBay before. I did a search for Philips 200WS monitors and it said I was outta luck!