Hmmmm?......very difficult....? Narrowed it down to three (or 4)
Always been partial to this image due to the high resolution and detail with just 6" of aperture and a mere 1140mm FL, the seeing was good that night

(I wasn't in Newcastle then

)
http://www.pbase.com/strongmanmike20...79166/original
This for its "Pow" factor (most viewed image at my web site with nearly 4000 hits since July last year):
http://www.pbase.com/strongmanmike20...15236/original
This because when I did it from my control room without touching the scope I felt like I had my very own Hubble Space Telescope:
http://www.pbase.com/strongmanmike20...34163/original
And lastly this is rather dear to my heart because it was my very first CCD image and taken after a more than 13 year abscence from astrophotography (so much had changed in astrophotography!!!):
http://www.pbase.com/strongmanmike20...00338/original
....Oh and this is a favourite too
http://www.pbase.com/strongmanmike20...60449061/large
Gets a lot of hits that image (nearly 1400 since May last year)
Mike