It's very easy to just blame AW for all of our problems. Perhaps we in the military need to shoulder our share of the blame with ever-changing requirements, yo-yo budgets (first save, then panic spend) and the veritable revolving door of Desk Officers, RMs and other Cap area inmates robbing programmes of continuity (yes, I know, that CS are supposed to provide that function, but they move their 'fast streamers' even quicker than the Mil do, and a lot of them are parachuted into senior posts for the 'tick' then leave before the impact of their decisions are felt).
Yes we paid over the odds for the AW Apache, but we did get a superior product in terms of engines and certain mission systems. The key factors, as always, are Requirements and finances. The -64E is a far better product than the D and, if it meets the needs and pocket of the AAC (both now, and, more importantly, through life) then we should buy FMS/DCS from the US. Just a rumour, but, allegedly, Boeing felt stuffed by AW over the original deal and in part it's why the Block 3 D model became the E model - AW's licence only covers the D.