Tell me which currency to start trading? Or from everyone who is at the top of the list?

 i sent some btc from blockchain  but today it still said unconfremed 0 nodes so i decided to download my blockchain wallet and add it to my desktop wallet my btc was there and now ive sent them to a diffrent wallet and they have arrived but now my blockchain says this

-1.3632 BTC $ -826.10
Confirmations
Unconfirmed Transaction!
Double Spend
This Transaction is a Double Spend!
Transaction Fee
0.0001 BTC

so now my blockchain wallet is stuck on - what can i do about this as someone is sending me btc to that wallet soon but since its saying - i dont know what to do

back up pool
worker is

imnottellingyou.1

pass x

STRATUM:   stratum+tcp://fed.notnull.org
PORT:   3333

thanks its saying i have to wait a hour to send more pm so heres my pool ect

stratum+tcp://us.coinium.org:3336

worker is

imnottellingyou.worker

pass is x

pm me when its up and running thanks 

il give you a $250 amazon voucher if you want to do a deal now 

whats your best offers in btc i dont ind going first to trusted users

dont mind going first for trusted user

any one intrested?