You'll need to keep the X LS Encore's out from the wall being they are a ported design if you want the bass extension they are capable of. If you want to place them up close to the wall, you can always plug the port and run them as a sealed design. The Encores come with decent net work parts (film caps, lynx rsistors, and I believe basic Erse inductors) but they are not equivelent to those found in the Studio monitors.
The Studio monitors are a sealed design with an open baffle tweeter. They'll be fine up close to a wal and the open baffle GR-Neo3 will bring you some air and detail I you won't get from the Encores. The Studio monitor comes standard with Soniccaps, Mils resistors, and Erse XO inductors as well as a set of tube connectors, definately a step up from the Encores.
You can order the Encore kit with the same network components but this adds to the cost.
The kits also use different woofers, the Encore kit uses the standard M165 while the Studio monitor uses the M165NQ.
http://gr-research.com/m130woofer-1.aspxand
http://gr-research.com/m165xwoofer-2.aspxYou won't beat the bang for buck of the Encores, they will amaze you .... you don't expect to get this from a kit at that price. If you go with the upgraded network parts, you'll be amazed that much more.... as other's have mentioned.. they will compete with some spendy monitors in the $5k range.
Going with the Studio monitors is going to open things up somewhat and take things to another level.
If you can keep the Encores ouit from the wall say 16-18", I think you'd be hapy with the bass extension. I have an upgraded pair in the shop and they are fine on their own (no sub) and they are actually positioned poorley due to space constraints. I have not heard the Studio monitors yet but with their sealed design, I'm thining you'd want to add a sub to fill in the bottom end.
jay