It will require that you install the free firmware update from Merlin to allow the track data by device feature.
I'm going to let BirdDog guide you on that one as I believe he has that router.
To be honest, I wouldn't really be the one to give advice about routers, as my experience and knowledge of them is limited. With that said, as long as the router is working properly, and not taking into account the increased number of things that can be done with a more expensive router, they will all pretty much give the same level of basic service. I'm sure that the performance of my $40 Netgear router is just as good as a $300 router. But, like mentioned, I'm not able to see many of the more technical aspects that could be seen with a more expensive one, and the router like yorkytime bought has additional capabilities of being able to monitor data usage with a special type of firmware.
If the speeds you get wirelessly with your Linksys are about the same as what you get when your computer is connected directly to the modem with a cable, and your Linksys has enough range for your home, it's most likely just fine for your purposes and a more expensive router wouldn't be much of an advantage for you. This is just my opinion, of course.
I should add that the Netgear router I'm referring to I no longer use much because it started going a little buggy a few months ago, so I have another one, but it's an inexpensive one, as well, and it works just as well as the Netgear did before it started getting buggy.
As Gabe stated if your speeds while connected directly, are the same as when using the router, then all is well really.
Different routers have different attributes. From a wireless standpoint some have better range, some are better in multi level homes with others be better in the horizontal.
Some are dual frequency 2.4 & 5 Ghz. On some you can adjust the wireless power levels.
On others such as Yorkytime's Asus after installing the Merlin firmware she will be able to look in the routers display and see how much data is being used and which devices are using it.
It is more a matter of "bells $ whistles" than something that can provide a boost. Presuming of course the router wasn't a choke point in the beginning.