For current sets I would have to agree with 42029 for your MOC idea, suspension and some great tires. You may also consider 9398. It has the suspension, and a larger set of tires. Best of all it comes with $85 in Remote components: 2 large motors, servo motor, V2 IR receiver, and battery. The Volvo loader is the only other remote set right now, and from what I've seen has had mediocre reviews. 9398 can still be found near msrp on ebay, but act soon if you do choose this set as it just retired last month and will become more scarce. Watch ebay for a good price on an 8070 as well, I have seen them go at msrp still on occasion, and its a really great set.
I recently got back into lego in July, focusing on space (no starwars) and technic, and was lucky to grab most of the 420XX technic line at clearance prices as they were phased out. I am now glad I did because I am not thrilled with the technical complexity or style choices of most of the 2014 and 2015 technic sets (so far) and am hoping this is not a trend. 42029, and 42038 are great though.