I'll be going for the Athena HG (fire ring) when I fit my dual avcs heads.
Turbo - I've always said if I was going for a completely new set up I'd go EFR as they have inbuilt WG & BOV so save the extra cost. With that in mind, they have the turbine wheel failure issue (especially on the smaller turbos which i'd be looking at) so need a speed sensor and some ecu smarts so it can't over speed.
Partsouq has a complete engine seal kit which could be worth looking into. When looking for the seals I need for the head swap I went onto ebay and found the "head gasket kits" which listed all the required parts, grabbed parts that suited. Someone on ebay might have a rebuild seal kit that you could copy.