Demitra owes me. It'll be at least two more weeks before I can actually go out and buy more for the army, so I'm kind of at his mercy as far as my current painting jones is concerned. As I said before, I'm really quite proud of how far I've gotten on this army in under a year, especially after taking a several month hiatus from painting 40k.
Demitra brought up a couple of points a while ago, however. What if I don't like the way the army plays on the tabletop? Well, in that case I'll have a very pretty army to show off my painting skills. What if sixth edition drastically changes how the game functions? Well, the army has always been a mechanized fast attack army, so I'm not too worried that the approach to fielding my army will alter drastically. In fact, I really don't think it'll change at all.
Then there's my worry. What if the army isn't sufficiently optimized? What if my list writing skills suck? Well, that's a whole other kettle of fish. Incubi are a risky proposition to say the least. They're a close-combat powerhouse optimized to take out elite infantry like Space Marines. Against hordes like Tyranids, or my upcoming foe, Orks, I'm fairly well screwed. Volume of attacks is their bane, with low toughness and a 3+ armor save I don't expect them to stand up to much beyond a 10 or so strong Boyz mob.
Wyches are also a gamble. I don't have any Wych Weapons in the squads, and they're (again) low toughness models. Here all I can hope for is for them to make it into my opponent's backfield unmolested to tie up (or better yet, destroy) his ranged support assets. This is actually why they have Haywire Grenades- to off tanks and the dreaded "rifleman" dreadnoughts.
In the end, however, I have a varied army I'm rather pleased with. We'll see how it fares in the heat of battle eventually (hopefully within the next few months) and I'll make a decision as to how (or if) my army needs to be refined. Until then I'll just keep on chuggin' along.