If you are planning on buying a TM and if you like M.E.U.
Why not just buy a TM M1911 M.E.U. ? You get the best out of the 2 world :P
Yes its plastic but you can upgrade it afterward with a metal body. I Personally love the NOVA M.E.U. kit for TM M.E.U.
That would be My buy. I have no idea on Army GBB quality. I only know they are TM compatible.