DIY Amplifier Class-D Bluetooth, Toslink - newbie

Hi guys,

i'm new to hifi, but i'm going to build some speakers for my living room, i think i will going to build the "Chorus 52 ACL" "Eton by ADW"(2 x Eton 5-612 RP and 25 SD 4).
I'd like also to build my first amplifier, i have no problem to solder smd and the stuff.
The amplifier should have an toslink and a bluetooth aptx input, also a 3.5mm audio jack would be good. i can spend about 300€-400€
Do you guys know a good kit which i could buy?