You can get more help with more information about the system you want to build. Do you already have the parts?
The following is a personal opinion. Based on your question, you still lack some experience. Before you try SDD and very large drives, may I suggest you buy two 500 GB data drives. Get the system up with one drive. And next test the second drive by making a 'clone' of the drive. Next, do some research or RAID. You can get very high performance with two SATA drives in a RAID. But you have to proceed carefully to get it right.
Without knowing what SDD you rethinking about, I would say wait until you have more hands on with RAID. At the present time, IMO, RAID gives you better performance for you dolor. SSD presently is suited for industrial applications where price is not a concern.
(FYI: Some 1TB drives are junk. IMHO.)
Here is a link with some information you might want.
http://www.tomshardware.com/forum/248547-32-raid-sata