hey all, i hope i'm posting in the right forum,
i am totally new to commuting and in fact i haven't cycled in more than 10 years. i recently moved to paris france and now that the weather is getting better i want to buy a bike for cycling around town on the weekends. the thing is i also want to ride around in parks and on paths. ideally, i would like something which is agile, light and fast.

so what kind of bike am i looking for?
can i get something which is between a commuter and a mountain bike?
i want to spend up to about 350 Euros (450 dollars max).

i have seen two bikes which are kind of interesting and in my price range made by Btwin, are they any good? links:

http://www.btwincycle.com/EN/b-twin-7-2009-69012114/
and
http://www.btwincycle.com/EN/rockrid...lack-33276628/

any advice would be very helpful,
thx!