Sci-Fi Bleg...

Okay, so it's not that I'm getting sick of Heinlein or anything, but it's time to branch out a bit. I picked up my first novel from Terry Pratchett (Men at Arms), and realized that, holy crap, this dude has like a hundred bazillion novels to his credit. He comes highly recommended in the blogosphere, so he's the next author I want to explore.

The question is, of course, where do I start?

I learned my lesson with Heinlien and reading out-of-order - I tackled The Cat Who Walked Through Walls before reading Time Enough for Love or even Number of the Beast. It was a lot like taking Biochemistry II before Biochemistry I, only with the many lives and loves of Lazarus Long taking the place of the Krebs' Cycle... Before I tear into a new (to me) author with a penchant for building on stories, I figured it'd be a good idea to appeal to those "in the know" where to start.

So... What books should I read first?

The top 5 or 10 should be a good starter; I still have a couple Heinlein books to read and another couple left to finish re-reading (I'd also like to re-read Monster Hunter International before shipping it off to He-Who-Must-Not-Wear-Pants). Any and all pointers are appreciated; while I'm a pretty voracious reader, my reading time is quite limited and as such I'd prefer to begin at the beginning, so to speak.

That is all.