Digital Camera - 4 Options! Help me to choose!!

Hi

Help me in these 4 things....

i)W80 vs T70

ii)Also Canon IXUS 70 vs Canon Powershot A710IS

Help me with these comparision...

iii)2k difference between Canon iXUS 70 & 75 is worth?? I c only Display size differ!

iv)Wat v call the lens in T series..?? Is that liquid lens?? Is there any cons with it??

Thanks Waiting for replies...