Yeah, the HR-05 is another option- it is big, but you have several mounting options if you need to rotate it out of the way.
No other company makes a heatpipe similar to that of the ASUS- in fact, as far as I know, ASUS is the only manufacturer that sells an aftermarket/replacement heatpipe cooler for its MBs.
I don't think the A8N-32 heatpipe will work on the A8Ne/SLI. The A8N-32 heatpipe intergrates two chipset blocks plus the VRM heatsink, while the A8N Premium heatpipe only consists of a single chipset block + VRM heatsink. It would seem that the second chip block of the A8N-32 heatpipe would interfere with something on the A8N board.
Here is a link to my installation process and results, with some pics on the next page. The entire thread (and many analagous threads on other forums) should give you fair warning that no matter what heatsink you ultimately end up using, replace the POS stock NB fan/fan housing. As you will see from the pics, I also ended up sticking an additional small heatsink on top of the block (flat surface + radiating heat = me unable to resist slapping another chunk of metal on top).