To cover some of the things you've asked, and I'll throw my "I'm no expert but have been reloading and researching techniques a while" disclaimer here, I'd say flash hole deburring and annealing combined with good dies (redding is good, I like my Forster seater with sliding sleeve) would get you squared away. Assuming premium brass, neck turning will just piss you off *unless you have a very tight chamber that needs the necks turned*, I had a hornady neck turner and an rcbs concentricity gauge, sold them both. K&M gets great reviews if you want to explore neck turning though. Check the reloading section on snipershide, there are stickyv threads at the top detailing lots of this, also if you're not on accurateshooter.com join there too. Lots of great references
I use an rcbs case prep center with a vld neck chamfer, primer pocket uniformer, and rcbs flash hole deburring tool (unscrew the handle and it fits the case prep center).
As with anything you can invest more money or time into it, you just have to decide how far you want to go down the hole and which you'd rather invest.