Following the HD 3870 and 3850's rumoured price cuts, AMD is reportedly preparing a new HD 3830, which judging by the provided info, will counter Nvidia's 8600 GTS. As HKEPC report (via TechConnect), the board still uses an RV670 core, and leaves the 320 stream processors intact. What separates the HD 3830 from the 3850 is apparently its 128-bit memory interface - which is half the 3850's. Unfortunately, the board's clocks are yet to be revealed, though expect to pay $119-129.
The aforementioned price slots the HD 3830 nicely behind the HD 3850's recently cut price of $145. HKEPC note that the board's core is apparently "locked" from being used on a 256-bit interface card. They add that this is not a re-branded HD 3690 - a board limited to China with matching specs - and it should arrive as early as April.