That Piper with one silencer is the cheapest system out there but they are very loud.... even more so if you eventually go for a sports cat or decat down pipe. (Piper also wont sell individual parts such as a second silencer)
They also look pretty rough in my honest opinion. (2 bean cans welded on the end of the pipes) LOL
I guess it will come down to personal taste on the looks and how loud you want it.
BCS will probably do you a deal for a similar cost. Speak to Nige but he can normally do 10% off for forum members, so their sports cat back comes in at around £440
Much nicer finish and look, better sound, less drone etc.
Just edit to add - Fire a PM to Herbie147 on here. He tried the Piper but sold it and bought the BCS so would be a very good guy to give a comparison.
Stays just round the corner from me........ And I thought these cars were rare...... I also park next to one at my works car park.