Advice on a path from 1G to 10G?

So I’m after some guidance/advice

We currently have a couple of 3750 stacks and we are looking how to move our infrastructure on a path to 10G with the old 3750 all being delegated to access use.

We currently have a lot of ports (around 200) for server/storage/WAN/phone system in use. Some are either channelled but the majority will still be in use until the hardware is replaced with new hardware that would have 10G nics. We do have some eigrp routing on the stack.

I have seen the

• SG350XG-48T + SG350XG-24F

1. Which would give us lots of copper and fibre at 10gig
2. But only stack to 4 units
3. And if I’m reading it correctly its layer 3 in the basic sense but no eirgp
4. Cheap buy in point.

• Catalyst 9300 series

1. New series so it’s not all on sale yet and no signs of fibre option yet.
2. Stackwise so up to 9 in the stack
3. Only 24 port 10G and hybrid 12x 10G and 36 2.5G so it can do more in the long run but more limited initially
4. Full layer 3
5. Higher cost

• 3850X

These seem very similar to the 9300 which I understand will replace them. Again 24 port 10g or hybrid 12x 10g and 36x 1G.

I’m not sure that the 3850’s would be the wisest choice as we could realistically use 4 of the hybrid 48port and then add in full 24port 10G in 18 month’s time. So I don’t want to get to the point that if we get delayed we find the 3850 are EOL.

Any idea when they will become EOL and when the full 9300 range will take over?

Am I right in thinking that for the SG350X series we would need a dedicated layer 3 for the routing for the WAN connections?

The 9300 seemed idea for a collapsed core to take the infrastructure all in one package but it’s the brand new series so while it has longevity is now too soon to jump on board?

Have I missed any other options that would be suitable to move from a 1G to 10G environment?