I've spent a fair bit of time in all of them. From DX Petrol, through RX, the new SL, ST and ST-X. Not really my cup of tea, but I'm not really the D/Cab type. I've also had two D40's (Thai RX & Spanish ST) as company cars and in spite of the fact that the chassis are very similar, the D23 is a massive improvement in comfort and refinement.
One suggestion I can make... You might want to consider swapping the 18" wheels for something smaller with a bit more rubber. The ST and SL with their 16" rubber actually rides better IMO.
Can't fault the engine, especially fuel consumption. :bigthumb:
I hope you get lots of joy out of it.