I dunno. With games like Sapphire, Renny Blaster, Fausette Armor, Magical Chase, Beyond Shadowgate, Terraforming, etc., you really are in AES territory. They both get pretty crazy these days. But that's really not the point; just a friendly warning about cost. If you're up for it, a lot of my favorite games are on the Turbo/PCE and the AES, and if you have the means, there are some truly great games to play. Once you take the plunge, I'd be happy to post a bunch of games that give great bang for the buck. Also, I think I already posted this, but read
www.thebrothersduomazov.com and videogameden.com (Ikermel posts here, even. They have tons of great reviews and screenshots.
Also, just do yourself a favor and pick up brand new sealed copies of Exile and Cosmic Fantasy 2 for US CD while they're still pretty available at good prices on Amazon or ebay.