Asgard be thine! The express bus through Kirby's Thor, collecting all Loki's appearances until just after he left, with short little detours from the likes of Buscema and capped off with a couple Neal Adams'. Collecting Thor can be tricky and expensive to do all in uniform format, so this can be indispensable for those supplementing their Epic or Masterpiece collections. The coolest thing about this book is the extended 100 continuous pages that links together over a dozen Tales of Asgard segments, including the full Ragnarok sequence, which is a wonder.
There are, of course, large chunks of the Thor story missing (about half of it), but for those unsure if three whole (not cheap) omnibuses are worth the investment (mind you, that's just for the Kirby part of the Thor saga. He quits halfway through vol. 3), this is a great way to find out, with enough little perks (like Silver Surfer #4, and a terrible Loki appearance from Hulk) to make it worth keeping even if you do fully dive in.
It's worth looking for out the DM Kirby cover, too. It's much cooler.