Firstly hi and welcome.
Secondly if this is your first gun I assume you don't have your UKARA registration in place yet so you'll need to have the gun two toned.
Thirdly and probably most importantly, don't get a sniper rifle for your first gun. Seriously, buy an AEG run around and hive fun. The general consensus is that sniper rifles are a very good way to spend a lot of money not getting very far.
That said, if your heart is set on the long guns then there's PLENTY of aftermarket upgrades around for the VSR/BAR 10.