Your M1A link is for a California-compliant model with a muzzle brake instead of a flash hider, and had no bayonet lug.
You might consider this:
http://www.budsgunshop.com/catalog/product_info.php/cPath/36_41/products_id/27446
This has a synthetic stock for $50 less, which will hold up a bit better over time than a wood one. The wood stocks compress as you disassemble/reassemble the rifle. The fiberglass stocks don't suffer from this flaw.
This particular one also has a flash hider instead of muzzle brake... but doesn't appear to have a bayonet lug. I like the lug just for the "ornery" factor, to spite anti's. I still don't have an M14 bayonet, but my M14 and AR-15 both have lugs!
*The M1A will come with very good sights, whereas the AR10 is a flat-top with no sights.
*The M1A will balance better for standing or kneeling shooting, since the weight centers on the receiver rather than being forward heavy like an AR design typically is.
*The M1A has an open receiver design which aids in extraction and malfunction clearing.
*The M1A can be fed from stripper clips when you run out of magazines.
*The M1A can be accurized to be a sub 0.5 MOA rifle if you've got the time, knowledge or money to do so.
*The M1A is a gas piston design rather than direct gas impingement on the bolt assy. This means it is "more likely" to run longer between cleanings than an AR, history being the judge of that.
*The M1A is less "scary looking" if you happen to have it slung over your shoulder in public (hunting, plinking, home defense, etc).
*The M1A is almost 1/2 a pound lighter than the AR10.