Right now the Pentax DL2 is the latest Pentax camera. There is very little difference between the DL and DL2 (about the only one I can think of right off is the DL has 3 focus points while the DL2 has 5).
Next month (July)Pentax is releasing 2 new cameras, the K100D and the K110D. They sound like they will be similar to the *ist D series cameras, but the K100D will have IS built into the camera body (they are rumored to have a different sensor, I'd want to see reviews of it before I buy). B&H has it listed at $699.95 for the camera with the kit lens (wouldn't be surprised if buydigwill offerit for less, they usually do). Since you are on a budget I would either get the DL now or possibly wait a bit to see if the stores lower the price of the DL in early July (assuming that the new K series cameras ship then). I wouldn't think the DLs would drop allthat much more than they are now, and think of all the practice you can have with your camera now. On the other hand, if you are in no rush to get a camera then it might make more sense to wait.
I bought my DS in January, and while the new K cameras sound really nice, I have no plans to upgrade right now. I'm really delighted what I have.