I have received bids on 3 different servers...with all things equal and cost being low consideration, I have to make a decision based on very little server knowledge. The following seem to be the critical differences in the bids.
1) Dell vs. Gateway vs. HP
2) Raid 1 vs. Raid 5 (we currently use less than 10 GB of file space now)
3) Tape vs. External Harddrive for offsite back ups.
I have read many of the past expert solutions but keep changing my mind on which is best