I don't find it fun spending money on a system, then spending more than I probally spent initally upgrading everything. - Thats one reason of the many I've chosen to build my own computer.
As far as designing a list of parts for you, most of us will help you for no problem and when you have your initial list, get ready to change it around. (I changed mine multiple times before I settled on these parts.)
So, your not interested in gaming.. Ok, well that could save you a few bucks on a graphics card and sound card. But, I'd still reccomend getting a substantial amount of RAM. (512-1GB - I reccomend 1GB)
So, from here, its all your choice and then we can continue to help..
Which processor would you like to use (AMD or Intel)?
In my case, I chose AMD because it runs cooler and its better for gaming. I prefer the quality of AMD over Intel, and its also cheaper than Intel.
Intel does have benefits as well. - From what I've heard, Intel is better at multitasking.
(Its all about preferance)
Do you ever plan on being a gamer? If so, we might want to set it up for gaming now so you don't have to upgrade alot down the line. Both are possible though.. so don't worry.