528e makes a good daily driver. Probably the most pickup of horsepower by a chip of any BMW. Transforms the car. Handling is more like an E30 than an E34. That said, the cost to keep it on the road is about the same as any BMW. Brake rotors cost almost the same for E28 as E34, pads same, etc. The cars are a little less complicated however and are a much more tossable in character. If it is decent at all and the major systems are ok or can be made ok for not much $$ then go for it.
Mike Holbrook
Meridian, Idaho
1992 535im, 17", Euro M5 Throwing Stars 8's & 9's, FK-451 235/45s & 255/40s, M5 Sway Bars 25/20, Conforti chip, Lowes Ram Air, glass sunroof