HP? I'll take real server iron!
Sun Fire X4170 M2 Tech Spec's
Sun Fire X4170 M2 Pricing
Great paired up with this:
Sun ZFS Storage 7120
Sun Fire X4170 M2 Tech Spec's
Sun Fire X4170 M2 Pricing
Great paired up with this:
Sun ZFS Storage 7120
HP DL360 - 1U, 192 GiB RAM, 2 PCIe slots, 2 GbE, 2 sockets (up to 12 cores), 8 internal disks
HP DL380 - 2U, 192 GiB RAM, 6 PCIe slots, 2 GbE, 2 sockets (up to 12 cores), 16 internal disks
HP DL580 - 4U, 1024 GiB RAM, 11 PCIe slots, 4 GbE, 4 sockets (up to 32 cores), 8 internal disks
HP DL980 - 8U, 2048 GiB RAM, 16 PCIe slots, 4 GbE, 8 sockets (up to 64 cores), 8 internal disks
look at http://h10010.www1.hp.com/wwpc/pscmisc/vac/us/en/sm/proliant/proliant-dl.html
Blades are a whole other ballgame, they run from less than a 1U to 2U and 4U expansion. Blades are also typically more expensive to purchase than the equivalent 1U/2U box - a blade usually doesn't make sense until you factor in the cost of floor space, air conditioning, support, ....
look at http://h10010.www1.hp.com/wwpc/us/en/sm/WF02d/3709945-3709945-3328410.html