Suggestions on amp and pre-amps for the following:

Main speakers are Kenwood KL 888 X
Front:- Tannoy MX2
Centre:- Tannoy MXC

Any advice on how to set-up as the Tannoy MX2's can be bi-amped? 5 channel amp will work but cannot be used to bi-amp. Can I bi-amp with a 7 channel? I can get my hands on a Marantz SR7400 at a reasonable price...

Look forward to hearing your suggestions.