Hey, can you guys help me with this build?

Solution
In case you want something in low budget, but still performing well,
get a second hand 4th gen i5 from ebay - it's easy to test and will cost under 100$
the MB would be better new. the model depends on the CPU, if you can fit a K CPU into your budget, you'd be better with Z87 or Z97 basedd one.
with the above parts, you can reuse your RAM (it's the latest platform to support DDR3).
This would be the cheapest decent MB for K CPU https://pcpartpicker.com/product/LWZ2FT/asus-motherboard-z97ausb31
for non K: MB start at ~45-50$, though a 75$ range is preferable https://pcpartpicker.com/product/rqkwrH/asus-motherboard-h97mecsmcsi

In case you want something in low budget, but still performing well,
get a second hand 4th gen i5 from ebay - it's easy to test and will cost under 100$
the MB would be better new. the model depends on the CPU, if you can fit a K CPU into your budget, you'd be better with Z87 or Z97 basedd one.
with the above parts, you can reuse your RAM (it's the latest platform to support DDR3).
This would be the cheapest decent MB for K CPU https://pcpartpicker.com/product/LWZ2FT/asus-motherboard-z97ausb31
for non K: MB start at ~45-50$, though a 75$ range is preferable https://pcpartpicker.com/product/rqkwrH/asus-motherboard-h97mecsmcsi

 
Solution