And you want to go fibre why?
The reason I have fibre is due to the fact that most managed core switches have fibre ports for the trunk. Both my Allied Telesyn gigabit switch and my Netgear have GBIC and SFP ports. I got allot of the parts needed for free or surplus for really cheap.
Fact is that all of my gigabit connections happen through good CAT5e cable. It's extremely reliable and the cabling is much cheaper and robust. I am just using ports that would otherwise sit idle and unused.
Having two switches between the server and a client is not going to effect your throughput, just your latency. It might add another 1mS to your ping, likely far less.
Bottom line is you don't need to go fiber. It does have advantages in that it is more reliable, connection to connection. You also need to be aware of that additional cost if you go retail though. Surplus it will yield a premium of maybe 20-30% in price over copper if you hunt hard and wait for the deals. It also has a bit of wow factor that the non tech types are impressed by.
I would start by surfing Ebay and seeing what is out there Then Googling the parts for sale to learn about them and look for reviews as well. Then make a list of parts to look for and be patient. You can post or PM me with any potentials.
Mike