okay, hear me out... Mikrotik CRS310-8G+2S+ IN and a CRS305-1G-4S+IN or another 10gb switch for cheap... about 300-400eur, 8x2.5g, 4x SFP+, and 1Gb RJ45. should be around ~30w as long as you don't use 10Gbase-T transceivers/L3 routing/etc