wooho! thanks to all of you for your answers and patience! ,..
yesterday I had a birthday party and I was out .. its a very nice surprise to see all this answers.. thanks again to all of you.
first of all I understand that its a pc whit a phone and not a smartphone .. and thats what attracted to me , also is a full Linux inside and also,. it has a good camera whit flash -_- I like taking pictures ..and listen music, audio is pretty good too regarding some reviews),and it has a full qwerty keyboard!,..and I really like the (¨in mine opinion¨) good construction quality, but aside of this ..
,... the capabilities of this pc+phone .. and the Linux running , its very appealing to have it .. sadly ,I have a win xp pc mostlly because I need for my work ( I need to run Photoshop and corel painter and other programs ) .. I was a long time thinking to swich to linux and start to learn ( thats why Im going to buy a second pc with linux :P ).. .. - About the apps .. well yeah,, android has .a lot ... I like their huuuge variety , but to be honest how many of those, I would reealy need and would use? maemo offers a good variety of apps.. and about myself.. I will use skype, internet connection , and some others,.. , and I would love to link to my pc while I m out of home .. but since my pc is a win xp ¬¬ and the ( linux users hide your smiles ,pleass DD ) I dont know n900 would be capable of link to my pc ,since its an xp :P -_-.. but this is not a obstacle to do not buy it .. I also was always think that big modern hardware are mostly for gamers.. ok I like to have 1 or 2 games in a phone .. for just in case ^^ buying a phone just for play games its a nonsense to me .. if Maemo has a good community support , and I will take care to do not over stuff it whit a lot of dumb apps .. I think is a good thing to go!

prices.. yeap its getting expensive everyday .. in ebay a new one is around 300 usd :P
N8 around 380 usd and E7:around 430 usd ( maybe there are some about 400$ usd ..)
but none of them whit the functionality and capabilities of the N900 .. E7 has a crap fixed focus cam .. all in all N900 is still a good warrior ! .
my fear and concern was about community support and understand what is better or more wise to use,.. Maemo, meego or some other ... but I think this was pretty clear thanks for u guys!

buying a used one ... hmmm it cross my mind .. but I think its not worth .. all the money and not be sure that its in perfect condition ..
best regards to all
Vladimir