I'd go with ST, not sure how much the Pug is but if your budget is bigger than required for the ST, I wouldn't be considering the Pug as second, probably have the Clio over it but as they're both French... I'd be tempted not to bother
The ST is thirsty and with the new one coming out it's bound to hit residuals, coupled with the low prices STs are going for, you'd be best placed to get a second hand ST for a bit and then consider your options when the new ST is out and its competitors offerings - just my two pence