i did consider taking mine to mountune for a full stage 2
in the end i ran the figures and i could be pushing 260+ in an impreza for less cost to myself.
i drove a mountune stage2 ST [as well as a clio 182] when i was looking to buy last year and felt like the fiesta was a little quicker
the clio did handle better in fairness [but the example i drove had heavily uprated suspension and brakes] so make of that what you will
the clio was certainly quicker off the mark.
main points as an every day driver:
the ride can be hard. not noticable on dual carriageway but it certainly doesnt like bumpy roads.
my car has been with me almost a year and been very reliable, minimal costs at servicing and readily available spares make it easy to sort out. pales into insignificance compared to the outlay of a friends 182 and its expensive holidays at the renaultsport garage
the car is desperate for a 6th gear, it makes driving on the motorway a chore, but in fairness i do country roads and a bit of dual carriageway on my daily route so it is more tolerable.
full tank lasts me about 8-9 days [20miles a day] and thats having fun. you can easily stretch it to the same kind of economy as a 1.4 by taking it easy [but wheres the fun in that]
there are a lot of optional extras to look out for, personally i would look at a facelift 06+ model as they seem to be holding their value better. i payed in the region of 4800 for mine but that was a part ex with my old car. im sure you would be able to pick up a very nice example with a solid spec for around £5k
you ideally want to try and find one that has full leather seats. i test drove a performance blue example that was really nice but had more mileage and far less spec than mine. the seats were comfy but the full leather upgrade looks a lot better. and heated seats+windows[front/rear] are very nice in the winter.
the only reason i am looking to sell mine is simply because i fancy a change. i could drive it for another 24 months and be fine with it, but theres too many other cars i want to try.