The e36 325i ( non vanos motor ) I have has km on it ( body rusting !! ) , the 328i has about 278000 km and just needs a 57 mm exhaust system , the e34 540i 6 speed has 229000 on ( with 57 mm sysytem ) , sounds nice .
The e36 will give long service with a bit of TLC along the way .
good luck , maybe look at a manual conversion . ( IIRC the 325i and 328i have different gearboxes )