I just bought my first bike today (Trek Pilot 1.2) and love it, but while I was shopping I rode a mountain bike and loved that too - and made me want BOTH!

I'm pretty sure my primary biking will be road so I wanted to get a decent road starter bike (which I think I did with the pilot) BUT now I am thinking of getting a mountain bike just for fun - different kinds of rides - options - etc. But was wondering for something I will ride occasionally, would a low end bike be ok?

The MB at my LBS started around $400 (Trek) but I went to Target and saw their bikes - some as low as $50! I don't think I want to go that cheap, but they had an all alluminum Schwin for like $179 (the SX2000 AL) Do you think going "cheap" on that is oK? Will I be missing something I "need" vs. the other low end Trek (~$400)

Thanks!