Vendor textures: 256x256 and sharp, or 128x128 and fuzzy?

I'm putting up a couple dozen vendors at my store, for animations (couples poses, dances, etc). Each vendor shows a blue/red figure, kind of the way Craig Altman does his. Each is maybe four feet square (in SL terms). I've got a 128x128 and 256x256 version of the textures, and the latter is much sharper. But is it also much laggier? What's the standard texture size for a vendor prim that is about 4x4 feet?

Many thanks.

I use 256x256 for the benefit of those who will zoom in on the picture to get detail.

Anyone knows if it is possible to track if someones camera is zooming in on a pic? That way, you can script the vendor so that it replaces the texture with a higher resolution one when someone takes a closer look.

I know theres a script in the scripting library section that makes an object follow your camera panning and zooming.

Thanks for your replies. I don't know anything about the script you describe, Cottenteil. For now, I'll probably go with 256x256; the 128x128 is just too fuzzy, and the 256's seem to load pretty fast for most people I've tested them with. I'm still curious what the "industry standard" for vendor texture size is, though.

I don't think there's a script that can tell where the viewpoint of a random av is. llGetCameraPos() now exists (1.7 on), but requires they give you permissions and although it could be scripted it would go berserk in a busy store.

llSetTexture also causes a delay to the script 0.2s, plus loading a new texture...

Just not worth it.

For what it's worth I usually go for 256x256 for detailed stuff, and 128X128 for a simple thing - I sell a couple of 'black box' objects for example, one of which is a box, some of which are strictly square-based pyramids but they're all (hopefully) usefully, but not really things that people will want to zoom up close on normally.

In my (limited) experience with rentals in commercial zones, vendor textures are usually restricted to 256x256 or smaller, and sometimes the renter is allowed to use one 512x512 texture. I haven't seen any rental requiring 128x128 yet.

Remember you can also use the rectangular proportions like 256x128, 512x128 or even 1024x32, for elongated objects.

Thanks for the further replies. This thread has been very helpful to me.