need help choosing the right switch

[Leonardo Canducci]

I'm setting up an LTSP classroom with 10 clients and an edubuntu
server. It's an high school lab for electric cad and simulation; no
multimedia. LTSP is not the only use and the classroom is connected to
a quite large school nework on the same subnet. Clients are quite
powerful pcs with gigabit ethernet and so is the server but they're
connected with some old 24 port hub I guess I'd better replace with a
switch.

Since I'm quite a newbie when it comes to network hardware and I'm on
a tight budget (100-200€) I really need help choosing the right
switch. So here come a couple of questions:
1. do I need gigabit ports in such a setup?
2. maybe two of gigabit ports (one for the server and one for the
gateway) is enough?
3. should I consider managed/vlan/layer3 options or I'm fine with a
standard unmanaged switch?
4. will any 50€ switch do or I'd better look for brands with proved reputation?

And finally: is there some specific model/brand you could recommend?

Thanks!
-- 
Leonardo Canducci