Up near the top must be Penyghent pot to the sump and back done on ladders back in the day. Just 3 of us to carry all the gear. Still one of those trips that I will take with me to the grave.
Likewise a trip done many years ago IIRC in County pot and out of Wretched Rabbit (well over 30 years ago so memory means it may have been a different one)
Swinstos through trip for just being so much fun, especially when the oil drum exit was a proper duck.
Giants round trip was always a favorite when in Uni in Keele.
Swildons short round with a bit of water about. Always a great sporting trip with plenty of variation
OFD through trips just for being long and sporting, again, especially if there is a bit of water about
Grotte Gournier for being my first foriegn cave and being so different and on such a different scale to anything in the UK done up till that point
Anywhere in the Schwarzmooskogelhoehle as it represented so much of my life when I lived out in Germany
The Hirlatzhoehle for being on such a mega scale as to be a step above anything done, even in France!
And finally an honourable mention must go to the humble Eglaes Faen as being my introduction to caving and despite its' deminutive size for having one of the most difficult/intimidating bits of passage I have ever done