Other than getting a carpenter in, I just can't find any study furniture that I like. I am going to share a large study with DH, and lots needs to be storage (we have 2 desks already) some in filing cabinets, others in cupboards and some on bookcases. IKEA seem to have the only sort of flexible system but I know from experience that it really doesn't last that well (billy bookcases did not survive 3rd house and 10 years) and it doesn't look that great. The study can be seen as you walkup the drive so I people will see it.
Surrounded by boxes and IKEA seems an easy solution but the proper office stuff isn't that cheap.
Any other ideas?