hi,

let me share a bit of experience i went thru b4 i bought my 1st bike last wk.

weight n size of fold u can find on d specs of bike.usually more light means more expensive.
better take ur car n try fold size if can fit into ur car boot b4 buy.

not sure wat u mean by able to roll...

i compared ori & tern b4 buy.
summary by salesperson, ori is like bmw while tern is like camry.
not sure below $3k can get ori...models i saw was ar9, m series sports.
i thk fold at front n rear wheels better than at mid frame cos logic tells me a frame with no joint is better than a frame with one....but tat is juz my opinion.

i thk below $3k, u hv many options.don't get a cheap one as wear n tear on cheap one is faster n will not last u for years unless u juz wan try 1st later upgrade.

get one tat fits d description of ur rides. better yet get one tat can be upgraded, eg convert 9 speed into
18 speed.

i tried many of my frens foldie b4 buy, i juz wan to say tat good handling, comfort, etc comes with a price.
try test d bike b4 buy.

lastly i din try out doppelganger cos i had my eyes set on ori n tern.

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Added on November 4, 2012, 3:48 pmoh yeah i forgot to add....
there are parallel imports bike tat r cheaper than those fm local appointed distributors.
be careful as d specs differs.
i found ori ar9 which abt $400 cheaper but it uses lower specs n it's parallel import.