What are you on now? Could you give us your height and an idea of weight? And where/what conditions do you ski? Most of all, what made you want to choose between the Hart and the Temptation? I've never skied on Harts, but on paper the Outbacks are in a different class than the Temptations.
Are you actually asking what kind of ski you should get to advance your skillset? That's a different question altogether, and a good one, too.
However, back to specific skis. I haven't demoed the Black Pearl, but I'm not sure I'd recommend it as the best ski to get your skills down on in hard snow/ice conditions, if that's where you are. At first glance the Hart looks more forgiving--I don't know anything about it--but for a tentative intermediate a 105mm waist seems a little overkill, and even less of an intermediate learner's ski.
That's the big plus about the Temptation 88 for this intermediate skier; it's firm, not so aggressive as to need to be pushed hard, but provides great feedback about whether my form is working or not. I feel like I'm skipping ahead; I've had two lessons on them and freeskiing afterwards has been a truly amazing experience. I'm short but let's say I'm built solidly, so a 162 is working great for me
Without demoing it's hard to say whether the Temptation 88 will challenge you too much or will just inspire you to get your skills on. I certainly would never have considered them if my skis had been unavailable and they were the only skis available in my length for a lesson. I expected to hate them--I certainly dislike the baby blue topsheet--but they've realy been amazing in a lesson on squeaky fresh groomers, a clinic in pushed-around piles of heavy chopped up powder, and freeskiing in shallow dry powder with better control and fun than I've ever had on skis. They are making me more confident that I can be a better skier than I thought I could, and that's an exciting idea I wouldn't have had if I stuck with my Geishas and Kenjas.
As for the topsheet, the ski rep at that demo day told me unequivocally that it's the only difference between last year's Temptation 88s and this year's, and you can buy last year's version in the wrapper for $400 flat. Our Christy's still has some, and depending on the length any number of retailers and online outlets have them in spades.