FR or CUPRA TDI ? buying help please

Ok chaps newbie here so please be gentle

Bit about me

well i own a mk4 astra GSI turbo wich was tuned to 250bhp but the time has come for the need of 4 doors if you catch my drift

and as i do like the leon then i thoght "why not"

now my first thought was a LCR to match the similar power that i had but then i also used to own a mk4 golf GT TDI and loved the low down grunt of the derv

so i decided to look into the 150bhp TDI leons so i have a few questions for ya all

first off appart from the alloys is there any big differences between the cupra TDI and FR TDI ?

also does the leon come with ISOFIX ?

and what sort of stuff should i look out for when looking at cars to buy ?

first two things on the shopping list will be a revo remap and a new clutch drive plate

its an FR+ i want but they are very thin on the ground in garages

so was thinking of a cupra or FR and fitting the cupra-r front bumper at a later date

cheers again lads

one last thing

is the side skirts and rear bumper on the cupra different from the cupra-r ?