First of all a couple of general comments:
1.
If you have 16 servers and it is an important production environment, you might want to consider a 32+ port switch and do LACP bonding with two ports for each server so you get redundancy on the cable side.
2.
If by "old connectors" you mean gigabit via RJ45 connectors, you are probably better off with them being on a separate switch, that switch connected via a pair of SFP+s to the "big" SFP+ switch. If you only have need for a few 1G RJ45's you can use SFP to RJ45 transceivers, but it doesn't take many to not be worthwhile anymore.
3.
Another thing you may want to consider is whether you have a need to route traffic between different VLANs/subnets, you should think about what kind of performance you need. It matters as to whether you should get a Layer 2 or 3 switch. You need a fairly beefy firewall/router if you want to route more than multi gigabit traffic (lots of caveats here, it's just to give you an indication).
With regards to options, you may also want to consider a
Mikrotik CRS326-24S+2Q+RM switch, it is only a Layer 2 switch, so any routing will need to be done by your firewall/router, but it is hard to beat the price.