Hello, I am about to upgrade my rig from a coupe of cards in my every day PC, to a standalone rig. I was looking at getting the Gigabyte GA-H110-D3A (https://www.amazon.co.uk/gp/product/B072NDFT1D/ref=ox_sc_act_title_10?smid=A3P5ROKL5A1OLE&psc=1) with 6 PCI-E slots and filling them all at the start.

But then I thought that if I want to expand in the future I'd have to buy an build a complete new rig, so I started looking into boards with more PCI-E slots, to give me room to expand later with less cost involved (simply the GPUs and another PSU). And I found these boards:

ASRock H110 Pro BTC + (https://www.amazon.co.uk/gp/product/B073BX57M1/ref=ox_sc_act_title_2?smid=A3P5ROKL5A1OLE&psc=1)
Gigabyte GA-B250-Fintech (https://www.amazon.co.uk/gp/product/B07988FLFW/ref=ox_sc_act_title_3?smid=A3P5ROKL5A1OLE&psc=1)
Biostart tb250-btc pro (https://www.amazon.co.uk/gp/product/B073JZ8C8Q/ref=ox_sc_act_title_4?smid=A2LNOP4UQZJ1&psc=1)

Has anyone used any of these and can give any advice as to which might be best to use?

I will be using Windows 10 on an SSD and running RX570s. Starting with 4 (plus 2x560s that I already have) and possibly expanding later in the year depending how it goes.

Thanks for any advice.