The Scott's are very nice bikes. I rode the carbon men's version of that frame and really liked it. I've even toyed with the idea of getting a Speedster to race/play on when I don't want to risk the carbon wonder bike.
It's on par price wise with any other 105 level, aluminum frame, well equipped bike. Whether or not that price is "worth it" is a personal decision.
As far as haggling. I don't like it. Either I'm willing to pay for something or I'm not, and either the bike shop is wonderful and takes care of me or they don't, IMO (hint: in the latter case I walk out...). Don't expect a deal on a brand new 2010 bike. It's early in the season and it's new stock. I've also been hearing numerous reports (here and elsewhere) about entire manufacturing runs already being sold out or backordered for months. If they don't sell that bike to you they WILL sell it and they WILL sell it at a profit, so there is no incentive whatsoever for them to haggle with you (other than your continued business, which, if you present yourself as the customer that's going to question and haggle every price they aren't going to really want unless they are really hurting...).
If they had an 09 on the floor, yes, that would probably be discounted, but it would also probably already be discounted on the tag.
If you've got to feel like you "got a deal" then asking for it in small services and accessories or working with you on upgrades at the point of sale is the better way to go about it (both from avoiding a bad taste in the shop's mouth and from getting what you want). 15% off any accessories bought that day is pretty common, throwing in water bottles or other very small items can also happen, swapping out components at a discount and with no labor fee can generally be negotiated (how much the discount is will depend on what they can do with the "old" part and other factors). Getting a slightly upgraded fit may also be a possibility. Paying in cash, yea, you may be able to get that tiny discount, but if the 3% you quoted is accurate you are talking $45, which on a $1500 purchase is just miniscule.
But a note/addendum to the previous paragraph. Some shops do all or most of this standard anyway; that's part of the value added deal of getting a bike from an LBS instead of the internet or a chain store. Other shops (those that don't advertise that they do this, or necessarily do it for everyone) will, if you are a regular face in the shop (and not a regular face that tries stuff on and then runs to the internet), start giving "bro" deals as favors, etc, especially on labor. I get 15% off every time I walk in the door on basically everything I buy (bikes excluded). They've "forgotten" to ring things (like CO2, gels, t-shirts) up. I can't remember the last time I paid for minor repair/adjustment, even on bikes I didn't buy from them. Last time I had a bike built there (Craigslist purchase), they wrote the "pro build" up as a "tune up", which was a 75% (or over $150) discount. When my bike was totaled a few months ago they put 40 minutes of labor and insurance paperwork together for me (at closing time, the day I walked in) for free (again, not one of their bikes). And, unless they are totally and completely swamped, they'll drop everything and do minor repairs (drive train adjustments, stans in a tire and reseal, etc) while I wait.
Basically, I have saved WAY more in the long run than I ever would have talked them down to on the initial bike purchase (heck, I saved more than I would have talked them down on the bike in that ONE build). I'm certain at least part of the reason this happens is I NEVER walk in there expecting the above treatment, and that's something to think about, assuming you want/see the benefits in a long-term relationship with a small local shop.