Going to buy my first Yaris soon but which one?

[Tyke]

Just sold my Citroen C3 Diesel, i only had it 6 months and just couldent get on with it.
I did like the £35 a year road tax and the 60 + to the gallon,
but i hated the way it handled and its flimsy build.
So now at the top of my list is the Yaris as i love its styling and that it holds its value and is economical to run.
Ill have about 7 grand to spend and im looking for one thats done about 20000 miles + or less.
The thing is im undecided on what model to get, i did decide on the 1.3 VVT-i TR 5d but its £120 a year road tax!
We also have a Citroen C1 which is really a Toyota and thats only £35 a year road tax so maybe the 1.0 VVT-i TR would be a better buy as that too is £35 a year and maybe even less come April.
Im 52 and love buzzing about in the C1 so will the 1.0 Yaris Suite me or will i find it under powered?
Ive never been one for aggresive driving and over taking all the time and ive never really owned a powerfull car but im thinking the Yaris looks heavier than a c1 and the 1.0 yaris uses the same engine so will the 1.3 be a better buy even though the road tax and insurance will cost more.
Ive not had a test drive in one yet but will be doing so in a the next week or so.
I only had chance to test drive the C3 for about 5 mins and thought it was ok but boy was i proved wrong, so im hoping i can take a yaris out for a good hour to get to know it.
Ive read lots of conflicting test reports and i honestly dont know which model to go for or if i should maybe get a Hyundai i2 !
So im hoping you Forum members can point me in the right direction on what to look out for and what model i should go for.
My main concern was the C3 had horrible body roll and hated being thrown about and bounced all over on uneven roads.
So is the Yaris a good firm handling drive or will it be as bad as the C3!!!!!
I dont want to get a second C1 as im wanting a better built car and one with more boot space.
Decisions Decisions!