Preview: how to find export file size?

Odd that I didn't find a thread on "save-as". Are they squashed?

I lament the loss of "Save as…", but I would be willing to accept the use of "Export…" wholeheartedly if I could predict the file size.

One of the main ways I use Preview is to normalize images without a lot of heady image editing; colour tweaking, size, ratio, resolution, then save JPEG's for use in iTunes cover art. The end of this task was normalizing an image file size as a JPEG. Now, all I see is a slider that gives me a relative file size and no indication of the absolute range I'm working within. The only way I view my desired file size is to export, then use Finder "get info" to see the file size as disk usage.

Is there a way to do this inside the Preview application, as a parameter of exporting, like I did before Lion?