I'd be surprised if you could get Team Magic parts easier than Xray, honestly.
That said, the E4RSII has a lot of nice features for the money, it includes a lot of stuff box-stock that are hop-ups for practically every brand, you just don't see Team Magic talked about a lot. Looking through the BD-7 thread shows a lot of happy people.
My TC6.1 was a nice build, but they aren't really "the best" anymore. Still competitive though, and can be modernized with an upgrade like the RSD6.2 Evo.