I'd have a serious look at this too - http://www.perth-wrx.com/vb/sale/11044-fs-autronic-engine-control-unit-sm4-pnp-2001-2005-wrx.html

All you'll ever pay for is tuning time - much better than reflashing.

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MY09 Evo X - 1.6bar@3500rpm - got lag?
Barbagallo - 56.03 (S); 1:08.09 (L)
Collie - 50.77
Possibly the most under-driven Evo X in the world??