The S25 and S50 look like they would suite your needs. [URL]   To get the best price quote I would contact your account rep or call into 1-800-456-3355
I chose the HP A5120 SI switch for 3 reasons: 1. Price - they cost about $1300 2. Warranty and Support - lifetime no extra charge 3. Features: stacking  Is there a Force10 switch that is comparable to this?  I would consider PowerConnect, but I hate the CLI.
HP A5120 Series Switch JE074A - Comparable Dell Product?