HI Dwight
This may be a long reply so bear with me
I think your choice of lenz 90 is excellent, but I would suggest a number of things to consider as this is a major purchase and should be a careful consideration for anyone.
A little pre-amble.
I have owned and used the following systems and in this order.. Digitrax Super Empire Builder with DT300 throttles, Atlas Commander with additional Handheld and Lenz 100.
For me, and this is all very personal stuff, the Digitrax drove me away from DCC. For me, a computer geek who loves technology, I just couldn't get on with the Digitrax and its (to me) silly throttle system with babay knobs that always seemed to have a mind of their own. I see nothing wrong technically with the system, but it didn't work for me, so I was upset at the investment gone wrong and became extreemly anti-dcc.
Then one fine day, someone on the Atlas forum offered to swap my empire builder and DT300 with an Atlas commander and an Atlas Hand Held unit. Since I wasn't using the Digitrax, it seemed like I certainly wouldn't be any worse off so I went for it.
Atlas systems have a BIG KNOB as the controller and the commander is designed as an entry system. However, suddenly this DCC thing was what I was hearing from everyone else.. it was FUN.
Many people told me.. you'll hate it, stick with Digitrax.. Digitrax does 4 digit addressing.. as if 4 digit addressing is some sort of Holy Grail, but some others told me.. if you can deal with 2 digit addressing (you have less that 100 locos) then everything in the Atlas system could be used if you ever want to upgrade to Lenz.
Well, I spent a year or so just playing and having fun with trains, and then decided to go to the next stage and integrate a full CTC system alongside my DCC system.. For this reason only, I upgraded to a lenz 100 system. Why not a 90? well although I love the knob controllers such as the 90, its a lot cheaper to buy a 100 starter set and then add a 90 controller than the other way round, and I had (of course) the Atlas commander and handheld controllers with knobs.
Now I have a wonderful system with Lenz and Atlas combined.. yes I still have 2 digit addressing (because I am still using my Atlas commander.. the Lenz 90 and 100 are all fully 4 digit adressing capable) and don't have a problem and a system I am extremely happy with.
OK I have finished rambling, but ultimately this is a huge investment. If you feel you can be happy with 2 digit addressing, I personally would seriously consider trying DCC with an Atlas Commander and Generator duo pack.. its about the cheapest way to get into real DCC. However, if you have the cash, the Lenz 90 is an excellent choice and very intuitive to use. If you prefer push buttons rather than a knob.. look at the Lenz 100.
If you have plans to link your system into a computer to make decoder programming easier and for some kind of automation later.. start with Lenz 90 or 100.
As I say, its all very very personal, and its very much what you hold in your hand that makes or breaks the system.
Whichever way you go, I am sure that you will have fun.. just bear in mind, there is a learning curve but stick through it and ASK questions.
The only silly question is that which isn't asked
Regards
Graham