I am with DaveO here, a ART will be a much better way to go than ANY Mackie mic pre.
I have yet to find many cases where the Mackie pre amp actually imparts a better sound than the ART, or a TL Audio pre.
The Mackies tend to have a very sharp, cold, crispy, edgy sound to them. The head room sucks which really prevents them from using a little pre amp distortion to smooth out transients when running hot. I have only found one time when a Mackie pre worked better for a track, and that was a Rhodes track I was recording. The Rhodes itself was not in that great of shape, and it was creating a lot of low end distortion. The Mackie's brittle sound helped compensate for this. But other than that, the Mackie pre just really doesn't compare. That is more than just a concensus of people on this BBS, that is a consensus of nearly every engineer I have ever talked to who has tried both.
Ed