What's your budget for the new system? Balancing the parts to your needs within that budget is the tricky bit.
I see you are using a 1080P TV as a display. To be fair even the AMD 270 GPU is a decent performer at that resolution and is significantly cheaper than the 280X, that frees up cash to get the SSD you would like to have. For a gaming rig 16GB of RAM is OTT to be honest dude so again there is money that can be shunted elsewhere or pocketed
The Corsair CX range is their budget line but it would be nice to have a semi-modular PSU. Seasonic, Antec, Bequiet are good brands to name a few, in fact many are rebranded units (XFX PSUs are Seasonic for example). For most single GPU setups ~500W is enough, 650W would run a pair of 270s, 750W for dual 280s although 850W would make more sense if you were serious about running dual top end GPUs and overclocking.
I think most if not all of the Z series mini-itx mobos have wifi and bluetooth built in. If you are running the rig through a TV you might prefer the smaller size and use a case like the Bitfenix Prodigy or Corsair's 250D. For a fullsized mobo (ATX) I'd be looking at the Gigabyte Sniper which is awesome value for money (£120ish). It has great onboard audio and xfire/Sli ready, read some reviews it really is the "entry level" mobo to aim for. I'd personally forget about a wifi card for mATX/ATX and get a pair of powerline network adapters to be fair.
Think I've waffled enough so I'll shhh for now till you have filled us in on your thoughts
All the best with it dude, I'm sure we are all looking forward to seeing what you settle on in the end