Three points:
1) alternate GPU->
*First, let's look at a COMPARISON averaged over a lot of games:
https://www.techpowerup.com/reviews/EVGA/GTX_950_SSC/30.html
I found nothing comparable, but for just over $200 if you decide you have a bigger budget or play around with other part costs (which I discussed above) about as high as you might swing is the R9-380 4GB:
http://pcpartpicker.com/part/sapphire-video-card-100384nt4goc2l
I probably could fit one in by dropping to an i3-4xxx CPU, getting a cheaper monitor, cheaper motherboard but it's not something I'd recommend. A nice solid system instead, then upgrade the GPU down the road. A GTX950 is still a great card for MINECRAFT.
2) also, lots of REBATES in my build (hard to avoid) so plan carefully and look at other parts if you want though make sure the quality is there (if comparing parts, Amazon is good to look at the average review score).
3) CPU cooler-> the stock included cooler works well enough but something like the $25 approx Cooler Master Hyper 212 EVO will be quieter.
Either way, make sure to setup your FAN SOFTWARE for your motherboard for your CPU (and possibly case fans if supported). For example, the fan might be at 20% max RPM until about 50degC then ramp up to 100degC at full fan speed (which it won't get to).