I don't know about the current Target model, I haven't kept up with them to see if accuracy has gone to pot like the standard carbines. I have one from the late 90s that will do .5" groups with cheap sub sonic ammo. If new ones will still do that pretty well what you have is just personalization for your intended use and maybe weight reduction.
Lets just use GM as an example, since they are consistently accurate and not really high priced. You can have a 16.5-28". Barrel profiles from standard to bull. Bentz chambers, target crowns. Muzzle weighted barrels, where the end is bull and near the chamber is sporter profile. Anodized aluminum barrels in different colors with light weight steel barrels inside. Fluted, spiral cut or plain. 1-9 twist for 60 gr sss ammo. Threaded muzzles. Finned like a tommy gun barrel. So on and so forth. This is just one company. I have no idea how many barrel companies are out there now. There are most likely hundreds of different barrel options.
If you only need 1/2" groups at 50 then you could save a lot of weight. A GM sporter weight with a target hammer will easily do 1/2" groups with a cheap subsonic round it likes. With a pawn shop donor you could have about $100 left over for optics when compared to a 10-22 target. Or if you want a bull barrel, get the same donor and apply the scope money to a stock. The factory barrel and stock can be sold to recoup.
Here's a good place to buy 10-22 parts. GM barrels go out of stock quick, but come back in as soon as they make a new run.
http://www.shootersdiscount.com/cart/