Do you have a free 5' 1/2" bay? You could always install it in that with an adapter. If not... then you can mount it anyway and anywhere you want, giving respect to cable lengths/airflow needs.
I'd consider getting a larger case if you are full up. Cramped cases are usually ovens!
Kula Masta HHC-001@7V
Pie-on-ear 16x DVD
LG Phlatron 795FT+
Opteron firstname.lastname@example.orgGHz (stock HS/fan), Asus A8N-SLI SE (passive NB), 1.5GB RAM (2:3:2:5, 2T), WD Raptor 740GD 74GB, Maxtor DM10 300GB, Asus EN7600GT SILENT@???, M-Audio Revo 7.1, Nebula DigiTV, Dell 2005FPW, Enermax 431W Active.