Tristan,
With the AE Aegis mains, I'd go for the Aegis
centre to sonically match the mains. The Tannoy centre won't be the same sonically and you may notice different tonal changes and sound level.
for rears and sub it's your choice. I have the Mission 77ds surrounds (dipole) and a Yamaha YST90 (100watt) sub. The surround were
£199 and the sub was £139. Both sound brilliant. I've got AE 109 mains and 107 centre and the AEs are really nice speakers both for music and movies.
At the end of the day, it's your choice but definately go for a matching centre as the mains.
Good luck
Dan
Website :
www.danwright.atfreeweb.com