What about hard drives? Conventional or solid state?

Do you sacrafice gigs for ultimate reliability? The reason I ask is I'm building a laptop and one of the choices is a 400 gb (2 200 gb) @7200 rpm or 128 gb ( 2 64 bg) solid state hard drives. I think most would probably pick the 400 gb off the bat. But solid state hard drives are always reliable, pretty much. I work in a "high noise" area thats why I lean toward the solid state. Noise and vibration can cause problems with conventional hard drives because of harmonics. ( I think) Come on yahoo, help me make up my mind!