Here is my all-electric system. The mash tun is a 10 gallon isolated Boilermaker, the HLT an 8 gallon Morebeer pot. The mash tun is heated using a 1900W induction cooker plate (yes, the Boilermaker works on induction). I resirculate, sparge and whirlpool using a March pump. The setup looks like a mess but it actually works really well.

I oxygenate the wort using a really simple inline system I put together from parts bought at Morebeer.
