@PearlWhen reading your post, I instantly thought the Janome Skyline S3 would be ideal for you: greater throat, LED lighting, needle up/down, start/stop button, lock stitch feature, easy interface and very quiet SM. It has more power than your current Janome and more stitches of course.
I purchased the Skyline S3 two years ago and love working on it. The only thing I miss is the feature of pop-up needle plates as the Skyline S5 has. But I decided to go for the 7mm Skyline S3 because I could use all the 7mm snap-on feet I already bought for my Janome DC2010. Step up is the Skyline S5 with even more stitches, 9mm feet and two pop-up needle plates.
Both sewing machines get very good reviews and are reasonably priced.
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Forgot to mention that the name "Skyline" is used outside the UK. In the UK and Ireland this line of sewing machine is called "Atelier.