Specifications, Pricing and Availability
On paper the 3.5" Vertex 2 has the exact same specs as the 2.5" model. At this time OCZ is offering the drive in 90, 120, 180, 240, 360 and a massive 480GB. Performance for all but the largest are very respectable; 285MB/s read with 275MB/s write. The 480GB drive takes a performance hit due to its size.
Newegg lists the same 3.5" 120GB Vertex 2 that we are looking at today for 229.99 USD. The 2.5" Vertex 2 is also listed at 229.99, so there isn't a cost benefit at this time for choosing the desktop model, but this should change over time.