Sadly Jeff there are not many others offering the range of locos either as a kit or RTR that JLTRT did or MM1 could.
For example let us take the class 37/5 sub class as that is a particular want of mine at the moment.
I could purchase a Heljan model for around £475 and then take a saw to it in order to create the loco that I want, followed by paint stripping and a repaint, while this is valid way of acheiving a 37/5 I personally do not like modifying RTR or hacking £500 worth of model that may or may not have some other mistakes made in its tooling etc.
The alternative is to buy a kit and build it, you have the very nice DJH kit, now only oproduced in batches when there is enough demand, priced at £525 less motor wheels etc, but (I am lead to believe) this is a quite a difficult kit to build largely on account of the massive pewter body casting.
The JLTRT/MM1 kit if re introduced may cost nearer £700 for the kit, so a finished loco would probably cost around £1000, however I would have the loco that I wanted from a kit specifically designed to give me that sub-class, built easily and in a reasonably timescale.
At the end of the day you pays your money etc, but the way that JLTRT produced tooling to allow all subclasses and variations to be modelled is a time consuming and costly process and those costs needed to be recouped and at the prices that JLTRT charged they were obviously not being.
Cheers
Andy