Once he and the Scouts are done, I will paint more Eldar. But I've also bought a Venerable Dreadnought some time ago. It's a great kit with a lot of options, not all of them look good in my opinion, but you can get a really nice model out of it. I will arm him with TL Lascannons and a Missile Launcher.
With the price rise coming soon I might get an Assault Terminator Squad to paint at some point in the future. I had a squad of Terminators in my old army, but I didn't want to strip them so I sold them off. As no proper Space Marine collection is without Terminators, I'd like to have some again. I also dream of a Land Raider Redeemer for the Terminators to ride in, and a Ravenwing Battleforce, which will make another Landspeeder so I have a pair, and a heavily kitbashed Captain on bike with a 5 marine bike squad, which can be a troop choice. But this won't probably happen until 6th Edition, as I will focus on my Eldar first and then start a Skaven army. And did I say I also own a full collection of all Jes Goodwin Escher Gang models, all unpainted?