Welcome to the site!
Well, i have to say.. 24,000 probably isn't reasonable, but couldn't hurt to ask! From what I've seen, the MSRP (sticker price usually) is almost 10% higher than invoice. With that in mind, the dealer invoice price is probably $26500. They're probably not going to budge below that because Nitro's are selling well.
I also wanted the 4x2 RT (since i have absolutely NO use for the 4x4 here in california =) - and i'm not a snow boarder or anything so no trips really to the snowy mountains). So, i custom ordered it and it's on a train right now. Hopefully I'll see it soon! (been almost 8 weeks so far!).
What I suggest is to find your own financing first. Capital One has a 6% interest rate if you intend to finance the balance over the $5000 and assuming you have good credit. Apply for it, get them to overnight you the check (costs you $15 for that service) and so you can write the check at the dealership. This will prevent the dealer from signing you up with their OWN financing which can be much higher than that 6-6.5% rate that Capital One will give you. They can try to offer their own financing to beat that 6% and if they do, great! if not, no loss. otherwise they'll just sign you up at whatever rate they want to toss at you. And if you're IN the dealership just inches away from your new vehicle, you'll probably sign up (that's their hope) at whatever rate they throw at you. Remember, the dealer gets paid for that financing from the bank they use. THe bank can offer the dealer a rate of say 6%. Then the dealer offers it to you at 7.9%. They get the difference to them in profit.
Just my $0.02
