Janome 134 RF is not really ideal for beginners. A bit more features would have made it more competitive. Not a big deal as it is discontinued.
Janome 712T has to be one of the best treadle sewing machines around. But you need to take some care in finding the best sewing cabinet for this machi...
Janome 5812 doesn't have a lot of features. In fact it even lacks some basic features that beginners need, it sews well nevertheless.
You can't project Janome 2222 as an ideal beginners sewing machine. There are some areas where Janome could have done a better job.
Janome 3434D doesn't have an ideal threading system. But if you take that part out, it is a good serger for basic needs.
Janome 18750 is a lightweight sewing machine with some nice features. But it is not a machine without limitations. There are some shortcomings.
If you don't love fancy stitches, then you would definitely love Janome Jem Gold Plus. The 4-step buttonhole is still a bummer though.
Janome MC 7700QCP is a wonderful high-end sewing and quilting machine. The plastic bobbin holder is a slight weak point though.
Janome 7034D is a good serger for home use. But there are better options available at a much lower price.
Janome 8050 would have been great, if you were able to get a new machine. Unfortunately there are only refurbished ones, it seems.