If you use File: Place menu command, it allows you to resize the imported ai, to final desired size, -before- it gets converted to bitmap format, at the dpi of the pic it's now in. If you are going to use it within Photoshop, applying filters etc, it's going to have to be bitmap(raster) format anyway. Best bet is to save the original .ai file (which is very small anyway--vector compared to raster) in the same working folder with the .psd file it's associated with. Good working habit.

RosemaryR
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"This...this is magnificent!"
"Oh, yeah. Ooooo. Aaaaah. That's how it starts.
Then, later, there's ...running. And....screaming."