I agree, that first Q is a fantastic feeling and very difficult to beat. However, in the short time I've been running, the most memorable run/win to date has to be my recent Jackpot run in CPE that completed Level 1 for me.
We had a HORRIBLE Saturday with lots of 'training runs'. I really wasn't expecting much from Edan on the Sunday. We ONLY needed a Q in Jackpot to finish Level 1. We'd been working on distance work for 6 months in an attempt to get that Q. It was the
only Q I really wanted over the enter weekend.
To add to the stress, I missing most of the course walk through because I was on the phone with my DH, outside, and didn't hear them call for the start of the walk.
Well, between the judge's use of a non-standard Jackpot course and having a rough idea of what I wanted to do from course maps, I took Edan and off we went.
We started with the Jackpot - a straight line "parallel" run with him about 12 foot too my right - containing a tire, tunnel and two bar jumps; something that should have been easy for him. I positioned him far enough back from the tire, and the gamble line, so I'd have a running start and the ability to 'push' him toward the tire before getting to the line.
Not only did we Q but we Qed with enough points to Q if we were running levels 2 or 3 instead of Level 1.

It was a GREAT run! I posted the video for it about 3 weeks ago. Look for the Sheltie TV, Agility Edition - Washingtonville. It was named something like that.