Question

FWIW, IMHO, even given the importance of matching your electronics to your speakers,  matching the speakers to your room, as well as their set up requjirement  is of equal or greater importance. Planners and electrostats require room placement, different from box speakers, that is not feasible in many rooms either because of physical restraints or visual impediments. 

You have good enough electronics (IMHO) to drive most speakers adequately, but I suspect from the manner in which you are selecting your speakers you may have done little to no research on room matching and set up and may set your self up for disappointment when you get them home and try to set them up. For example to get that 'great sound' stage you are going to have to get them out about (at least) 5ft into the room and that is where the process starts. They usually do much better in a large room.

do you have any recommendations Newbee

I believe the XA30.8 would work pretty well also in a small room with your speakers assuming you plan on listening below 105db or so.

As a reference, I used an XA30.5 for about 3mo in my room driving a pair of Magico S3's which are a more brutal load than the Wilson's are. The room is 25 x 15 x 8.5 (H).

Eventual I ended up moving up to an XA60.8 but could have easily lived with the XA30.5 if I was forced to for budgetary reasons. The XA30.8 is even more robust in terms of its output capabilities. The power supply is roughly 380-400w. Figure almost 1/2 of that output is available for each channel when you consider the extra headroom available when the amp transitions from Class A to Class A/B mode.

I was quite impressed by what the "little" XA30.5 could do in terms of output despite what it says on paper and no doubts that the XA30.8 would be even more impressive given my current experience with the XA60.8

I have no information on your situation upon which to base any recommendation.

 If you care to provide the dimensions of your room, the locations of doors and windows, a description of its furnishings,  a few comments on where you would propose to place the speakers, your budget, what kind of music you will primarily be listening to, and as how/where you will be listening, I could probably give you a few thoughts.

http://www.cardas.com/speaker_placement.php

This supports newbee's suggestion. Certainly not "the rule" but effective.
Any other detail probably a speaker forum topic