there r 3 Nissan showrooms in Doha as per my knowledge, (1) In Al - sadd, (2) in b/w Hamad signal & TB roundabt..& (3) in salwa road opposite next to Jarrir book store..colours r white in two types, Golden (biege), silver, Brown ( amethyst Gray), Supphire black & red.
for 1.6 Tida cost is in b/w 55000 - 60000 & for 1.8 it is in b/W 61000 - 65000..now these days 1.8 is far better than 1.6..
regards...