In the USA, ATI's AGP line has more to offer high end than NV's line. You can buy a X850XT for the price of a 6800GT and the 6800U has about dissappeared. NV is releasing a 6800GS in AGP to help fill the gap above the 6600GT. That will be nice and they should be showing up very soon.
I can't help you find a card in Europe. The GTO is not yet available in AGP AFAIK, although you may find a plain X800 still. I'd look for a AIW X800XT, an X800XL or X800 pro as they are all single slot. The 6800GT is also a good option. It is about equal to the X800XL, beats the X800 pro, but loses to the X800XT. The X800GTO is lower than a X800 pro, but is a nice card if/when found in AGP and priced right.
My order(single slot AGP):
ALL IN Wonder X800XT
X800XL/ 6800GT/ 6800GS(coming soon)
X800 pro
X800GTO (supposedly coming soon)
GF6600GT
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