Given that you're more interested in the ranged combat, I'd say emphasize the Warlock and maybe use the ED stuff for emergencies, buffing, and battlefield control. If that's the case, then you don't need that much cleric casting. I mean, you can do a ton of battlefield control w/ relatively low level spells like Entangle and Blacklight (which might not be on your list, but you get the idea). I second the Cloistered Cleric -- I think Knowledge Devotion has potential and also the other devotions could be a lot of fun. Maybe stuff like the party support devotions or Earth Devotion could be good, or a couple of persisted (DMM) or chained spells could be really worthwhile.
That being said, I'd definitely be sure to jack your blast damage to make it worthwhile. There's the warlock compilation guide that has some good stuff in it. Off the top of my head, I'd say the psionic shot line of things would be the way to go, especially if you want to combine them w/ travel devotion. Travel devotion + flyby attack + psionic shotted eldritch blast = good damage and absurd mobility, nobody will get close to you.