If you're like me, you don't have the budget to hit every writer's conference you'd like to. However, if you can only make one, I'd highly recommend the ACFW Writer's Conference in Dallas this September. My reason is this: if you can only afford one, make sure it has everything you need in one place. At ACFW you have plenty of workshops to choose from, no matter what your genre, you have agents and editors who-this is key-make themselves available throughout the weekend for you to talk to. If you're a beginner, you can talk to writers of every level. If you're an old codger with 30 published novels, you get to hang out with a lot of fun people.
The cost isn't bad, either, for an event of this magnitude.