the truth is - there is a ton of artwork out there. If you have a wide taste, there is no shortage of great stuff to discover over time. every time I get a piece of art, it means I am not getting something else. So I usually try and not have regrets of this type. I have on occasion though found an item I failed to buy, come up again when the new buyer goes to sell it. I take those opportunities to add to my collection.
@Michaeld - was the vendor of the Hellshock piece - Splash Page art? they had a bunch of classic Jae Lee art. I almost picked up a different page myself- but other purchases maxed my spending ability.