I am thinking about spending £150 on the N54L microserver + get bit more ram + a low profile gpu like the 640 which should run quite a few older games on medium settings (bf3 @ medium @720p is ~30fps apparently) natively + steam streaming. And should come in at under £250 all in and will also serve as a always on NAS/media server and such
Although controller lag is minimal, display lag at this momet can be more obvious in certain titles.