I am going to go a bit overboard and list 5 cards in ascending order of importance (I also apologise now for the crappy pics as I do not have a scanner)
5) 2009-10 Upper Deck Draft Edition - Autographs #34 Stephen Curry AU, 238/249 — Was very happy with this pull at the time but at that stage Curry was not the phenomenom he is now. Certainly a card that has become more significant with time.
Steph Curry
4) 2004-05 Upper Deck Hardcourt - Engraved Endorsements #EE-DH Dwight Howard AU — the first big name auto pull I ever had. Howard was a monster at this stage and I was hyped to get this card. Thought it looked really cool and different too. As Howard's career has unravelled this card has no doubt gone exact opposite of the above Curry's in terms of significance but I was so excited when I got it.
Dwight Howard
3) 2006-07 SPx - Flashback Fabrics Autographs Spectrum #FF-AJ Al Jefferson AU, MEM, 1/1 — my first 1/1 and a jersey auto to boot. Not only that "Big Al" was a bit of a beast at the time. Despite the wheels falling off his career a few years later (going to the Bobcats will do that...) this was stil la great pull — and much better than the second 1/1 I pulled a few years later Go Go Krylyo Fesenko!
Big Al
2) 1998-99 SkyBox Premium - Autographics #NNO Chris Carr AU — first basketball auto I pulled. My younger brother had just got one a few months before so badly needed this to pull even! I would have loved it to be someone a bit better than Chris Carr but this one is till memorable.
Chris Carr
1) 1994 Dynamic Series 1 - Signature Gold #SG3 Brad Mackay AU, 916/1000 — first auto I pulled when I was about 11 or 12 years old. I had no idea what autos even were. I used to buy packs of these at the local supermarket and go through the boxes rubbing each pack as the gold cards had raised names and were usually inserted at the back or front of the pack. Took me a long time to realise this one was autographed and the others i had were not and neither were any of my mates gold cards. We must have opened hundreds of packs and this was the only auto we ever got. From teh state of it you can tell this card travelled everywhere with me — it even went through a whole rugby practice rubberbanded next to some commons in my pocket!
Brad MacKay
Hopefully all the links and pictures work!