I find with clusters it's nice to have a cluster to play around in so you can test and understand changes better.

We run a Active/Passive 2 node Windows 2008 R2 with SQL 2008 R2 cluster.

Recently i purchased a "cheap" HP DL160G8 with just 2 x 6 core CPUs 32gb of ram and 6 x 600GB 10k 2.5inch drives. I installed Windows 2012 Std installed the hyper-v and windows storage server roles into the host OS. Then i just created 2 Windows 2008 R2 guests, Created some ISCSI LUNS on the host OS created a private network between the host and the guests and presented these disks as the "SAN". Created a private network between the two Guests for cluster traffic and then gave them access to the real network.

Built the cluster and installed SQL 2008 R2, seems to work great for testing and learning. The performance actually isn't toooooooo bad either. All 6 disks are just in one large raid 5 LUN but it's only used for testing how the cluster responds to changes etc so yeah.