Don't know why you think AMDs are weird when they are the simplest processors in existence, but oh well...
You are a hard customer, expecting something good with an Intel CPU, one of the best you can find it this one (has pretty much everything you need while having some room for improvement too):
https://pcpartpicker.com/product/x8M323/gigabyte-motherboard-gab150md3hddr3
It's most likely isn't gonna be cheap though as DDR3 Motherboards are getting pretty rare at this point...
And you know, if the only problem you are having is really your CPU, why do something so big to change rather than just getting a Ryzen? I mean, you already have all the parts you need, the motherboard supports Ryzen because it's AMD and not Intel (that forces you to change mobo every 3 processors) and will solve you the CPU bottleneck issue at lower a price than the i5 alone!