Mate, opinions are like @rseholes, everyone has one.
Go along to your local site or try out your team mates markers. Find what works for you.
£550 will get you an IR3 on air, maybe and electro cocker on air, an Impulse on air, Matrix on air etc etc.
2nd hand from a reliable person is a good way to start. Ch.ances are when you have more cash you will want to upgrade again anyway
Speeds are nice.