I drive a 350 and a 172 on a daily basis.
The clio is more exciting sometimes as you can drive it more on the edge than you car or dare in the 350. But the 350 is more rewarding to drive its like a pat on the back when you get there.
The zed does feel lardy compared to the clio but it does have the torque so unlike the clio you dont have to keep changing gears and revving it (sometimes good) you can stay in 3rd or 4th and just ride the torque wave.
IF you are wanting something faster than your clio I wouldnt get the 350 as its not hugely faster in real world unless your an amazing driver but the seating postion is better, it sounds awesome and its pretty cool. The 1*2's are still IMO silly quick for a hatch with awesome handling so if you increased the power of the clio by 20-30bhp (not that easy on a F4R) you would have cars that are about as fast as each other.
Dont want to put you off and Im not bad mouthing the 350 before anyone starts but giving an honest unbiased opinion.
One thing is you dont have to replace the gearbox mounts every 2 seconds