I've got a Coleman 2000watt 2500 peak. I found that it works fine for running a milwalkee right angle. I don't know about a bogged down holw hawg though. Small and easy to pop in and out of the van by myself. $229 I think a year or two ago. Do all the layout, fire it up, do all your holes at once, and fire it back up a little later to get the ones you missed.
But if plan on growing into it, you might want a little bigger one. I opted for the 2KW because I got sick of breaking my back on my brother's 5kw 11hp techumsa (sp?) loading it in and out of the van. But If you plan on running a 500watt quartz and a HD drill at the same time, you'll need bigger.
