2016 Mazda2 - if you're talking a out cars like this, sometimes it can be a scam, what kind of guy would buy a car in 2016 then sell it in the same year unless this is a reposes unit but usually you don't get such information from the salesman they usually try to assure you it is a good car but owner upgraded or some bullshit because if he tell you it is a reposes unit then you'll immediately think it won't be maintained properly, right?

2016 VW Vento/Polo Sedan/Polo Hatch - if you want a cheap car with full warranty your best bet is a Volkswagen nowadays. First the naming conventions the Polo started out as a 1.2TSI car but DSG/TSI issues made customers worry so they introduced the Polo Sedan which is a 1.6MPI engine with a regular 6 speed gearbox (not DSG and no turbo) older technology but very reliable and you still get the refined conti interior feel (unless you really look you'll find most VW interiors quite similar in look and feel). Later they launched the Polo Hatch which is also fitted with 1.6MPI & 6AT. Now they're launching the Vento which is the Polo Sedan with a 1.2TSI engine & DSG gearbox. Supposedly the latest TSI engine and DSG gearbox have rectified the issues of the previous generation which is why the Golf MK7 with the 1.4TSI doesn't get so much negative feedback as the MK6. Anyway, back to you and what to choose. The Polo Sedan/Hatch with the 1.6MPI engiine and 6AT gearbox from Aisin would be a good upgrade for you. Although the Waja is a C-segment car the Polo Sedan is a modern B-segment which is larger than older ones so space wise it would be about the same iinm, plus you get a few nifty C-segment toys like rear passenger aircon and multi-function steering wheel. Performance wise it should be better with 6 gears and of course better fuel economy. This particular seller is even giving you free 6 months installments as a discount. This is a good compromise of conti interior but japanese-like maintenance because of a more simple engine/gearbox. So once warranty over you can bring it outside to fix at cheaper prices.

Since you've owned a car for so long you should be comfortable to buy a used car since you know where to get things fixed cheaply and what usually goes wrong. Getting one with warranty or new car only forces you to use the expensive SC/3S.

2012 Suzuki Kizashi 2.4 - superb Japanese D-segment saloon. Suzuki is not known for making D-segment cars but they really made one as good as a Mazda6 and similarly spec'ed but RV drops like a rock which is good for you as you can pick it up for only 70k from it's original price of 140k 

Unless they've vastly improved things since a few years back the TSI engines and DSG gearboxes are quite temperamental.
If you've tried the 1.2 first the only to the 1.6 then of course anyone would be biased towards the 1.2 because when working that twincharger makes you feel like you're driving a Ferrari.
However, that is the issue. Unless there have been improvements you might get frustrated as many VW owners have been regarding either one failing, the problem was exacerbated by VAG impotence, avoiding game or trying to pin the blame on owners.
The new Golf MK7 with a 1.2 and 1.4 TSI engine and DSG gearbox so far so good but would you really want to be a lab rat?