Well in my opinion the LHE +large turbines has a huge material cost and requires material upkeep and multiblock maintenance. To make sense to use it should be at least as good as the stirling engines or else I just wouldn't bother with it and would just make a srirling engine array.
Also when I said normal I meant steam so two large turbines both using the same type of rotor.
I know IC2 doesn't feature energy loss these days, but I wonder how much that would cut into your profits if it did. A GT5 turbine is a single point of contact requiring much less wiring. Your array would require considerably more.
(In infitech2 we've removed IC2 wiring. No free power transmission for you :p )