This is the only card I could find that might come close to a be enthusiast class, low profile and dual slot.
http://www.newegg.com/Product/Product.aspx?Item=9SIA6ZP3S28124
Here are the known features
■ Super small at only 7 liters
■ Premium styling front panel with mirror finish
■ Includes one 120mm fan and support up to two 80mm fans
The 120 mm fans runs at 1500 rpm and is quiet at 18dBA.
There is room for two 80mm fans (not supplied) on the side.
■ Multipurpose 4-in-1 bracket
■ Support Mini-ITX motherboard and SFX power supply
■ Support dual slot low-profile graphics or expansion card
■ Support four 2.5" HDD/SSD
All point info copied and pasted from manufacturer's website
http://www.silverstonetek.com/product.php?pid=653&area=en
Dimensions
350mm (W) x 99 mm (H) x 205 mm (D), 7 Liters
350mm (W) x 109 mm (H) x 205 mm (D) (includes feet)
Net weight 2.07 kg