Proxmox White Box

I was considering an ESXi whitebox with this:

CPU i5 4570
MOBO GigaByte GA-Z87M-D3H
Case. NOX NX-1 Evo
PSU LC Power 550W 6550GP V2.2 120mm
RAM 2 x Corsair Vengeance 8GB DDR3 1600 PC3-12800
HDD 2 x Seagate 1TB Barracuda 7200rpm 64MB SATA 6.0Gb/s
Cooler ARTIC COOLING FREEZER 7 PRO REV.2


However I realized that ESXi didn't supported the motherboard raid... so I would have to buy a card... and then more money...

So I thought about buying a Samsung 256GB SSD Pro instead of "Raiding" two Barracuda.

Long story short: I discovered proxmox and thought about trying it (with this hardware). What do you think about it?

My goal is to run:

1 webserver (500 visitors/day)
1 elastix pbx
1 active directory (study purposes)
1 exchange (study)
1 general windows server 2012 (study)

Thanks