The simplest W140 you can own, and the one thats the closest to the diesel is the S320. My friend just sold his 1997 and it wasn't a terribly complicated car, well no where near my other friends S600. With the I6 you will enjoy a lot of room under the hood as well, and a lot of stuff on the front of the motor will look familer to you, since I see you have a 606.

The S320 is the slowest gas W140, but its still not bad. It will leave the diesel in the dust, the M104 does put out about 80 more hp than the diesel. Its no autobahn monster like the S600 but I never felt it was lacking for power. It will run 80-100 all day long without complaint, it just won't loaf at 100 like the V12 and big V8 will. The plus side is you'll get far better fuel mileage with the 6, high teens around town, over 20 on the highway. The 722.6 gearbox really makes the most of what the engine produces, since its a 5spd and pretty smart.

The S320's also lack SLS, they just have gas shocks all the way around. They still provide a supurb ride.

You want a 1997-99 with low mileage and a no BS service history. The last W140's are the best, they kept sorting them out as they went.

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2006 CL500
2009 C300 4matic
1969 280SE
2023 Ram 1500
2007 Tiara 3200