preferred format for impulse files

[kensuguro]

I've been messing with Voxengo's impulse modeler, trying to create a "packed" club. Which is me trying to address the issue of most impulses being created for completely empty rooms.
Just wondering what the preferred impulse format is. 24bit 96k? I'm not really sure how the sample rate affects convolution. I'm mainly focusing on clubs and medium theaters (like 500 -800 cap), will post if anyone's interested.

[Warp69]

The convolution engine/plugin would have to SR convert the IR if the user is working with another samplerate.