Hi cybersim,
Pls refer back to page 122. We covered this comparison already.

Hi, i also surveying the foldie now. this is my answer for you question
1. dahon, better frame build but low end component. ( good/worht for upgrade later )
2. java , 1.5k pao everything. but not sure about frame.

Digest this link. it should be give u some idea which to pick.
http://handsonbike.blogspot.sg/p/cheap-vs-premium-bikes.html
Trinx also. 

rm2200 u can get MU or Vigor. Personally i prefer vigor over MU. which i going to get this week. lol. Happy hunting bro ! 

as far as i know only until dahon 2012 version got seat post pump.later model dont have any seat post pump anymore but u can buy the seatpost pump undername biologic.

i think i saw it at billiybikeshop at taiping

Actually, it is a effective pump. Fast, especially for high volume tires like Big Apples BUT as you said , it is heavy, very heavy in fact. When I was riding in a group, almost 6 person has that pump so, I changed my seat post to a lighter one but later on I changed back to the Biologic. Why? Because those lighter seat post like GUB or Litepro can only take 75 kgs and I am almost 100 kgs. It squeaks!    No choice for me, hihihi.

Dahon has stopped putting in the pump because they have ceased getting Biologic as their OEM manufacturers. Biologic sided Tern. 

If you are interested in the concept, there are many pumps that are cyclindrical and can fit into a normal seatpost. You just need to get those PVC pipe fittings and modify it and hold the pump inside without dislodging and rattling inside the seat post. Most importantly, it doesn't drop out of the seat post when you ride as foldie's seat tube are hollow all the way down to the tarmac.

If you want to upgrade this, you have to upgrade 2 items. The brake levers and also the shifter itself. You can go for Shimano Deore brake levers and also the Shimano 8 speed shifters. Yes you can use back the original cables and housing. If you are upgrading both the items, might as well add another 100 plus bucks and upgrade to Deore V-brakes as well, that is if you are using V-brakes lah! 

Fny.Hon is the same people who are contracted to build Dahon's frame, only without the warranty. It;s quite good actually. Customizing is very expensive but you are getting what you atually wanted without wasting un=used parts later. FnHon has most of Dahon's design, only size is what you need to consider. 14, 16, 18 or 20 inch?