New server: SSD/RAID recommendations?

We're buying a new server in the near future to replace an aging system.
I'd appreciate advice on the best SSD devices and RAID controller cards
available today.

The database is about 750 GB. This is a "warehouse" server. We load
supplier catalogs throughout a typical work week, then on the weekend
(after Q/A), integrate the new supplier catalogs into our customer-visible
"store", which is then copied to a production server where customers see
it. So the load is mostly data loading, and essentially no OLTP. Typically
there are fewer than a dozen connections to Postgres.

Linux 2.6.32
Postgres 9.3
Hardware:
2 x INTEL WESTMERE 4C XEON 2.40GHZ
12GB DDR3 ECC 1333MHz
3WARE 9650SE-12ML with BBU
12 x 1TB Hitachi 7200RPM SATA disks
RAID 1 (2 disks)
Linux partition
Swap partition
pg_xlog partition
RAID 10 (8 disks)
Postgres database partition

We get 5000-7000 TPS from pgbench on this system.

The new system will have at least as many CPUs, and probably a lot more
memory (196 GB). The database hasn't reached 1TB yet, but we'd like room to
grow, so we'd like a 2TB file system for Postgres. We'll start with the
latest versions of Linux and Postgres.

Intel's products have always received good reports in this forum. Is that
still the best recommendation? Or are there good alternatives that are
price competitive?

What about a RAID controller? Are RAID controllers even available for
PCI-Express SSD drives, or do we have to stick with SATA if we need a
battery-backed RAID controller? Or is software RAID sufficient for SSD
drives?

Are spinning disks still a good choice for the pg_xlog partition and OS? Is
there any reason to get spinning disks at all, or is it better/simpler to
just put everything on SSD drives?

Thanks in advance for your advice!

Craig