standard edition vs enterprise edition

Hi All,
 
We are planning to buy oracle edition to run on a Solaris box ( dual
CPU). 
( Its going to be OLTP and the no. of concurrent users will be 10.)
 
Solaris box configuration:
 
Sun Fire V240
2x1 GHz Ultraspace IIIi
4x512 MB DIMMS
2x36 GB drives
4x10/100/1000 Gigabit Ethernet
 
Could somebody suggest the above configuration is fine for 10 concurrent
users. and what oracle edition we can purchase for the above
requirement.
 
Standard editition and Enterprise edition ? (what are the differences
between these 2 and the price info if you have in US$ )
 
Thanks in advance,
Srinivas

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