Hi people, I hope everyone is doing well
4ndr3w: It depends on wich side and which PC Case you have and which way you put Mugen in. It should be possible to use it, but if you want to palce the fan over the heatsinks of the Mobo, you need to make sure, the space in the case to the top is enough, otherwise you won't be able to close the side panel.
The RAM should be fine, you can cover it with the 120mm Fan.
Socket Am2 is not compatible to the retention kit yet, sorry.
SocialUser: A8N-SLI Deluxe should be fine, I did not see or hear any issues yet. It seems to be fine based on my experience.
djskek: Asus P5Q Pro is what I have here, it seems to work fine with Mugen. Only the huge RAM heatsinks are a bit of a Problem as usual.