I have an 18.1" Iiyama TFT monitor which has 4 inputs: DVI (digital video interface), SVGA, S-Video and Composite. I have connected the RGB out of my A4000 to it and it works, but for some reason some of the colours are slightly offset - may just be my monitor, though. Nonetheless, it's quite useable, and actually has the effect of a Flicker Fixer - I can use PAL Interlace completely smoothly on it. I think the model number is AS4636D or something like that.
Be warned, though - it was quite expensive.... very nice though!