Best GPU for this case + motherboard

Okay, this is pretty much hypothetical at this point, but I'm still tossing around ideas.
What would be the best low profile GPU that would fit in this rig?

So far it seems to be the R7 250, which is much too weak of course.

http://www.newegg.com/Product/Product.aspx?Item=N82E16811108448&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-na-_-na-_-na&cm_sp=&AID=10446076&PID=3938566&SID=

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: Intel Pentium G3420 3.2GHz Dual-Core Processor ($69.99 @ Amazon)
Motherboard: ASRock H81M-ITX Mini ITX LGA1150 Motherboard ($59.99 @ Newegg)
Memory: G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-1600 Memory (Purchased For $0.00)
Storage: Western Digital WD Green 750GB 2.5" 5400RPM Internal Hard Drive ($68.98 @ Amazon)
Case: Inwin H-Frame Mini Green Mini ITX Tower Case w/180W Power Supply ($179.99 @ Newegg)
Power Supply: Athena Power 400W 80+ Bronze Certified Flex ATX Power Supply ($95.98 @ OutletPC)
Total: $474.93
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-05-09 05:06 EDT-0400)
 


Hmm... A 750 would be great, comparatively. I'll have to compare measurements.
As for the PSU, apparently the 180w it comes with is pretty low quality, I'd rather have some extra breathing room under load.

Edit: Nice! The cooler is the only thing that takes 2 slots, and VGA coolers and brackets can be replaced. Other than that the measurements are about the same as the R7 250. I'll be keeping an eye on that low profile 750 TI OC.
 


I actually do have a quite large and competent case now. Problem is, my CPU is so out of date that even the Pentium G3420 beats it, and other parts aren't far behind. Since so much of my PC is going out of date at the same time (mobo, HDD, CPU, PSU), and since I'm not as big of a gamer as I used to be, I'm playing around with the idea of scrapping what I have and building a small low-impact PC instead as long as it doesn't lose too much performance in the transition. I mostly play older and lower spec games now, though it's still weird to think of Dragon Age as being old. XD

An R7 250 or HD 7750 would be a bit too large of a loss, so I'm hoping either the low profile GTX 750 fits, or that I can find a similar case with a bit larger dimensions.

The other option I have is to wait for Devil's Canyon and revamp half my current full ATX mid-tower, but that would lock me into it for the next 3-4 years and I haven't made up my mind if it's worth it when I don't even play many new games.