Welcome!
Learn the basics with your OM-10, and you might find that the latest SLRs don't offer much that you really need. Even on my old Canon F-1N, I don't use any of the automatic features that were the hot thing back in 1983. All the mechanics really just do three things--focus, set the aperture, and set the shutter speed (and if you have TTL flash, some cameras will automatically compute the flash exposure for fill). It's not too hard to do those three things, and if you do them manually, you have more creative control.