Having ridden quite a bit less than most people on this forum the latter end of my top 10 table won't be very impressive. But anyhow
1) Dragon khan (rode in 2006)
2) Nemesis (first rode 2003)
3) Jubilee Odyssey (when rode in 2002 it had just opened and was so much smoother and less clattery/bumpy/neglected/rusty/dilapidated than it is today)
4) PMBO (rode in 2003)
5) Colossus@thorpe (when rode in 2004 when it was tolerably smoother and pleasing to the eye)
6) Rita (first rode in 2007) its the only accelerator ive rode
7) Oblivion (first rode in 2003)
8) Air (first rode in 2007) love the flying sensation just havent been able to appreciate the bigger versions of this setup.
9) Rock N roller coaster (DLP, 2005) LIM launch packs a punch and the indoor roll over not quite as painful as anticipated. awesome scenery and aerosmith
10) Stampida (rode in 2006) enjoyed the racing feel and ranks better than the grand national due to the layout