Get to Reno at the end of January, look at some knives, spread you cash around a few initially so that you learn how to judge fit and finish, what style and materials you like.
Buy direct from a collectible maker at a show and you should be able to turn it around without loss (or very little) quite quickly.
Dealers like Les Robertson can steer you in the right direct also.
You could do worse than buying one from Nifrands collection on the for sale forum.
JS and MS are a good indication of a certain level of competence ..... but as with most things some are better and more collectable than others, there are also a few JS's (and non ABS guys) making MS quality.
Makers I look at regularly in no particular order: Fisk, Newton, Dean, Hancock, Cashen, Andrews, Dunn, Fogg, Hanson, Neely, Potier,Connor, Zowada, Williams, Farr, Sfreddo, Rhea, Knight, McIntyre, Butler, Gatlin, Wheeler, White ..... there are others such as Fitch, Ferry, Christiansen, Winkler and many more with ardent fans .............. you get the picture!
In the end the money and choice is yours, but before laying it down follow the advice of the forumites ... research and shows!
Stephen