You can get cheaper motherboards but thyre not really upgradeable .
The Antec 300 is a gaming case with lots of air flow . If you want to make it quieter you can disconnect fans . It vents hot air quite well with them disconnected
Another $15 gets you a 1 terabyte hard drive
Will this build stand the test of time? Is there a future upgrade path?
Nothing lasts forever , but there are better stronger processors , and room for more powerful graphics cards . Right now I dont think you can do better for the price , and there should be an upgrade path for several years