The Absolute edition IS the definitive publication of WATCHMEN to see print... but yes, it IS pricey and you DO need a bloody sturdy bookcase to keep it in!
Twenty years later, WATCHMEN remains THE singlemost greatest achievement in sequential art storytelling to date... the ULTIMATE comic book, fusing the written word and the illustrative composition together like nothing else before or since. Many have tried, some have even come close... but none have succeeded quite like WATCHMEN. It's the only comic to win the coveted Hugo Award, it made TIME magazine's 'Top 100 Novels Since 1923' list, they teach the damn thing on university courses... and that it's the brainchild of three of 2000AD's illustrious alumini makes it all the Moore satisfying. Makes yer proud to be British, so it does!
Reading it back in the day in its original 12 issue serialised form was an entirely different animal... but I would urge anyone to get hold of the TPB (for the authentic WATCHMEN experience, try reading a chapter a month - just leave a gap of two months a couple o' times since, due to delays in its original run, it took a full 14 months to wade through!)
Admittedly, some may find its Cold War setting a little dated now (are we really living in the same Climate of Fear as we did in the Eighties?), but ultimately WATCHMEN is about what it means to be human - I would hope that it has lost none of its power to make you think as a result.
Enjoy.