Like you I want the latest and greatest, and since I'm in the Mac forum I don't mind paying for good workmanship.
Me:
- I'm not a gamer (anymore)
- I use VM's a lot
- I use Photoshop, Premiere and Lightroom
- I need (want) the fastest cpu + gpu, most mem, biggest SSD, best screen money can buy... so I want the 15" rMBP (ME665A/X)
What do we know:
1.- Haswell is %10 faster clock for clock, but generates ~15% more heat.
2.- Iris is 40%~75% the performance of 650m
3.- Haswell + Iris will give you ~15% better battery and ~50% if you're using the dGPU.
4.- New products usually have issues, and they don't get resolved for 1-4 months.
5.- There's a dearth of Haswell laptops... MBA and very, very few Windows machines.
6.- The Haswell's around are clocked lower but offer the ~ same performance.
What's up for debate:
1.- There will probably be a refresh quite soon (December) as manufacturing lines improve yields and process.
2.- There's quite a high probability Apple will opt for iGPU in the rMBP's it's easier, cheaper, more elegant solution, with significant battery saving and in most cases offers better performance just bcos of the iGPU dGPU switching.
3.- PCIe SSD... this on paper blows everything away... but in real life testing only seems to speed up IO by 10%. This is my most wanted feature.
4.- Since there are SO few haswell's out there any Apple seems to already have the most... I really doubt they'll be releasing anything until some competition arrives. The competition is trickle feeding in, and will start ramping up towards August > Sep... so I think October will be the date for new rMBP + Mavericks.
5.- 802.11ac is another nice to have.
So bottom line:
1.- We'll have to wait for October before we can buy.
2.- We'll have to wait for December before we can buy stable system.
3.- For the wait we can expect the same CPU performance.
Less max GPU performance, more everyday GPU performance.
10% better IO.
50% faster WiFi.
There's always something better coming.
Early adopters often pay for their impatience.
What's it going to be?
The way I see it:
Best to wait until December-February, or already bought.