Evening all,
Sounds like either a pole or tower would fit the bill.
basic lowdown is:
Poles: removeable, gives a higher pull, can flex a little, looks pretty ugly. cheap.
Towers: removable, Gives a higher pull, will give storage for racks etc... in the future to hold your boards, more solid then a pole, looks better, costs more....
Poles start at £295 in the UK, towers start at around £995 (excluding monkey bars and other random asemblies....)
Resources that may be of use:
www.wakeboardtowers.co.uk (shameless self plug!)
wakeboat.com
wakeside.com
and for other opinions:
forums.wakeboarder.com
Hope that helps.