To Trade Up or Not: Nintendo DS edition

I haven't really wrote about the new DS Lite that is comming out in the next few months (probably summer). I believe I now have the information to determine whether to sell my old DS (the one that came with Mario Kart DS) and get the new iPod...I mean Lite version.
I originally thought of not doing it, since WiFi games like Mario Kart DS have profiles that are linked to that specific DS. Another blog asked if it was possible to correct this, and appearently a little known feature can transfer the original DS's profile and information to the new one, but would also reset the old DS to factory settings (here: http://nintendo-centrum.blogspot.com/2006/02/ds-lite-vs-wifi-games.html).
So it comes down to design and expense. The DS Lite (DSL from now on) is smaller, and would probably feel more comfortable for first person shooters, where one would use their thumbs rather then the stylus. And let's face it, it does look much better. It also has a much brighter screens then the current model.
On the negative, the GBA slot is not as large, which means any GBA carts would stick out. Some of the other things are still unknown, like if the shoulder buttons are still as awkward as the current ones. I have also heard that GBA games have a minor problem with the even brighter screen.
However, I fear that cost would be an issue. While the US price hasn't been announced, the Japanese price is around 140 US dollars. Knowing Nintendo's unwillingness to subsidize their systems, I think it would probably launch at the $150 price point. Even if they released it at the current $130 (without a packed in game), they are phasing out the original design (story: http://www.nintendojo.com/infocus/view_item.php?1140368058). I wouldn't be suprised that the original DS's price would be dropped, either officially or unoffically, to $100. Which, in turn, would mean that the medium price at EBay would be lowered. Even now, looking at a search of EBay, the system could be bought for under $100 easily, some even offering games as well.
So additional money would have to be spent to upgrade. Considering that the differences between the original GBA and the GBA SP models had more sigificant differences, I would have to say unless you absolutly have to have the most current model, just save the money and get another game. The only reason to upgrade is that Nintendo included better compatability with routers, and you have a router that just isn't working with the current model.