I can highly recommend the Cyma 098 platinum its their pre-upgraded version of a SR25, out of the box its pretty damm good I got mine from taiwangun for less than £180 which was a steal seeing as its £269 at patrolbase,
came firing 460fps out the box and can fire full auto so needed a little work but only took me 30min to sort.
The advise Adolf gives above is spot on learn your gun before you try and put upgrades in