Rebuild questions - Old Xeons to Comet Lake

I currently am running a X9DRi-LN4F+ / 2x 2650v2 / 80GB ECC RAM / Quadro P2000 / etc. It is clearly overkill and a power hog.

I am thinking about moving to a Quicksync enabled build to reduce power and simplify it out. 90% of my usage is Plex - 3-4 streams max;some HDR/4K/Atmos stuff admittedly.

CPU: Pentium G6400 (next year change to i5 11th gen for better transcoding support)

CPU Cooler: ARCTIC Freezer 34 CO
Motherboard: MSI z490 Tomahawk
Chassis: Supermicro SC846
Drives: 8x HGST 6TB
RAM: Teamforce Vulcan Z DDR4-2666 32GB
Add-in Cards: LSI 4i4e flashed; Quadro P2000; Supermicro SFP+ card
Power Supply: Bequiet 750W

Questions:

1. Will I be short PCI-E lanes? G6400 has 16 available I think - the z490 was selected to maximize lanes later in case.

2. Related, do I need the Quadro?

3. Where can I shave cost safely?

- MB - z490 Tomahawk is admittedly overkill, but I find OC ready boards have great VRM cooling

- PSU - is top tier and has lots of headroom.

- CPU - G6400 might not have enough power;