Okay, I spent a little bit of time looking around, and I found a few alternatives that match most of your requirements. They might be a little bit on the heavy side, at least compared to a MBP, but they are by no means too heavy.
For quick reference, the GT 740M gets 23FPS, a GT750M gets about 30-40FPS playing DOTA 2 Ultra detail, while the GT860M gets between 60-80FPS, a literal doubling of performance for a Valve Game that you said you wanted to play.
The Intel HD series (4400, 5000, 5200) get 12-20FPS, 15FPS, and 40FPS, respectively. The MBP you suggested would use the HD 5000.
The both the AMD 8670M and the AMD 8650G get about 19FPS. In dual graphics mode, they get 39FPS.
You could very easily drop quality, keep the resolution and get playable framerates out of any of the options listed above.
First, I'll get the slightly more ridiculous option out of the way.
You
could get a Microsoft Surface Pro 3, when it releases. I have a friend who has done all of his University classes on the first Surface tablet *He is in computer science* and he is currently doing graduate studies using it, and is absolutely content. The problem is that unless you spring for the more expensive models, you'll get terribly graphics *at least, compared to the better options, my laptop uses Intel HD graphics (Pentium class performance) and I can play Minecraft and SC2 multiplayer just fine. I do make big quality sacrifices, however.* No link as it isn't released yet.
Second, and more seriously, you could get a
Lenovo Y50. All the options come with the same Intel
i7-4710HQ, they all have
Nvidia 860M GPUs (The most expensive is a 4GB card, the others are 2GB cards), and they all have 1080p screens. Their main differentiator is the hard drive + caching SSD option. I'd stick with the cheapest option, which is $1149 CAD, and comes with 500GB HDD + 8GB caching SSD. Also, only 1 has a DVD player, the $1299 model, though that's unlikely to be a huge issue, so I'd still stick with the cheapest one. They all have excellent wireless solutions, and are generally well rounded. Expect poor battery life, though Nvidias Optimus should help a lot.
Third, another Lenovo option (Last years model). The
Y510p is about $900 CAD. That's a pretty big saving, but you do drop a lot of performance by going to a
GT 750M. It would come with a DVD player, unlike 3 of the 4 new Lenovo Y50 models, but you lose 802.11AC, while gaining a 1TB HHD + 24GB SSD.
Fourth, an
Asus model offering Dual Graphics mode operation from AMD, a nice change of pace, even if you don't like AMD. This laptop aims at the value proposition, the same way that laptop #3 does. It's also 1080p, has 1TB HDD, but no caching SSD. All Asus laptops come with a 1 year accidental damage protection plan.
It is using a Richland CPU, and there is strong evidence that before school starts in September, AMD will have their
Kaveri mobile chips in laptops for retail. You might notice how very short that article is currently. When it was originally posted, it was long / detailed. Likely it is the case that either AMD threatened to not send anymore chip over for review, or also possible that AMD threatened legal action if Anandtech is under an NDA. No need to speculate though, the only important thing is that you don't need a laptop this very week, which opens up for options quite a bit.
Fifth, I am running out of patients WHY ARE YOU CHAINING ME TO MY DESKTOP, I WANT TO SLEEP!!
Sixth, it's only
$99999 CAD. Does not come with free shipping. (I suspect that the price was supposed to be in Yen, given that it ships from Japan).
Seventh, and hopefully last, actually, I can't find something with a quality screen (meaning they are all 1366x768). If you just want a laptop that is able to make presentations, write up documents, send emails etc, seriously consider a Chromebook. Most have abysmal screens, but there are some, such as the Samsung Chromebook 2, which have 1080p screens, however I am having issues finding one. For about $250, you can get a laptop that does productivity things, though I imagine you'd rather use your currently working machine.
I'm sorry that I didn't get too many options. My preferred one is the Lenovo Y50 for $1149 off of the Lenovo Canada website. If there is anything else I can do regarding this topic, I'd rather just get to sleep and eat in the morning. (Can you tell I am way too tired to be interacting with actual human beings?)