1) mount a mini itx to the back of a 24" LCD screen using the vesa mount system. The purpose is to integrate a small powerful PC (hence mini itx) on to my rock'n'ride machine which can move in 3 axis - gaming with movement.
2) find a powerful mini itx mothermoard with a fast integrated GPU - For emulation and PC gaming purposes (for the rock'n'ride).
2) Using an IGP means using low graphics settings and low resolutions in 3D games. Not exactly what you to hear if you're using a 24" LCD. The best available IGP is the HD 4290 (mini-ITX MB Asus M4A88T-I Deluxe 880G) or Intel HD Graphics (GIGABYTE GA-H55N-USB3 and i5-661 CPU) Intel HD Graphics performance review 880G Graphics Performance Review
Depending on the game's you're looking to support and for good 1920x1080/1920x1200 3D gaming performance and all the eye-candy graphics settings I think you're going to want at least a HD 5770/GTX 260 or better video card maybe something like a HD 5850/GTX 460.
And that means a larger case for the video card and power supply sized to the video card.
1) Since you already need a LCD monitor power cord leading out of the Rock 'n Ride chair you might as well remote the whole PC and skip the limitations of trying to mount a mini-ITX case to the monitor.
Otherwise you'll need to get a VESA 100x100 bracket set and figure out how to attach it to a PC case that is big enough to hold your full size video card. Maybe something like a SILVERSTONE Sugo SG01 with SeaSonic M12II 520W modular power supply. Add a Core i7-860, GIGABYTE GA-H55N-USB3 mini-itx MB and GTX 460 video card and you're in good shape for 3D gaming in a mini-ITX form factor.
I was not aware of the mini-ITX MB Asus M4A88T-I Deluxe 880GW until you had pointed it out - Interesting board.
By the looks of it after reading the links you have provided, the GIGABYTE GA-H55N-USB3 with an i5-661 CPU seems to be the better performing mini itx board on the market currently (for gaming)....? - better than the mini-ITX MB Asus M4A88T-I Deluxe 880GW.
The IGPU on the i5-661 seems to be faster than the HD 4250, but if comparing the IGPU on the i5-661 to the ION and ION2 which would be faster of the three? I am assuming it will be the i5-661 by a long shot...?
My project requirements is to place the fastest performing mini itx board (for gaming) which does not have a discrete graphics card into the M350 universal case enclosure (highly probable, unless I find or someone finds for me a case very similar to the m350 universal case enclosure).
I am also willing to hold-off purchasing a mini itx which has a integrated GPU for 6 months or so if I know there is a manufacture which will be releasing a board which is faster than what is available on the market today. (Do you or anyone know what the near future holds for mini itx boards with integrated GPU?)