I feel the same way about my 135. I'm doing a full suspension install so the handling matches the power (Dinan stage 2). This car is so engaging and visceral that I had to buy it once I test drove it. That was 2 yrs ago, and I still feel the same way about my car.
The 1M will be incredible with the wider track and higher end suspension parts and upgraded engine parts and LSD. I hope I don't get a chance to test drive it, or I may be drawn in by it's magic. I'm getting goose pimples just thinking about it.