Indeed it should be a good setup. Starting with Intel CPU is the way to go and I'd congratulate everyone doing so and did congratulate myself (and still am) when after many years made the change from AMD CPU's to Intel ones. Yes, AMD might be 'more bang for buck', but for 2/3 of price to that compared of Intel's you might only get 1/2 the service life you'd get with Intel (and I don't mean that AMD CPU's just break down. You just might hit a point of insufficient performance a lot faster).
At least that's how I see the situation when comparing these two CPU providers so everything regarding the discussion here are just my opinions
Consider buying an additional HDD for your games and other stuff, unless your external one can be used for storing and playing the games from, which I doubt.
Using an SSD is astronomy of some sort, there's almost witchcraft involved (if following the communities debating about SSD usage) and lots of information that you should consider revising before actually taking an SSD to use.
Common understanding is that the less use an SSD gets during its lifetime is better. Lot of read/write events will shorten the lifetime of the SSD considerably, so it is suggested to have as few programs on your SSD as possible: the most optimal situation would be that you have only an operating system on the SSD and nothing else. Even using Firefox browser from SSD is not encouraged, since Firefox is caching a lot of information by default to its directory on C: drive, which produces a lot of read/write events.
Take a look at this thread: Windows 7 Install & Optimization Guide for SSDs & HDDs
There's a lot to cover, but you'll do more than good with that one particular guide to setup your system for SSD.
I'd suggest to up the amount of RAM to 12Gb if you're going to turn your H&G HC-mode on once again (with how many accounts open at the same time?) after getting the setup done. I'm occasionally facing "Your computer is low on memory" notifications from Win 7 (got 8Gb RAM installed) with three accounts open and the game running at the same time. Now I'm not sure if that has something to do with my custom memory settings on Firefox, so I'd like to hear how everyone else is doing with their PCs when using multiple accounts at the same time on the campaign map and also playing with one of them.
I'd also suggest taking a look what nVidia has to offer from their product range. As an avid ATI (HD Radeons) user I'd still think of getting an nVidia GPU someday. You actually might get as good performance with lower tier GPU from nVidia than with a higher tier GPU that's based on AMD.
No possibility anymore to get hands on a copy of Windows 7? Isn't Windows 8 the "every second" operating system from Microsoft that isn't just good at all no matter how you try to put it in to perspective.