I want to be able to train for boxing at home, and I was wondering if there are any quintessential items I could use daily to help better my fitness and boxing conditioning.

Is it better to buy one big piece of equipment like this:
http://www.fitness-superstore.co.uk/__12_product_info3_asp2_5_prdID4_34167_prdName39_Studio%205%20Gym%20%28200lbs%20Stack%295.html
or buy seperate pieces??????????

I want to get something for using at home and would like to know which piece of equipment would give the best all-round workout – rowing machine or exercise bike, or something else?
It has to be not too big, and available at no more than £200
thanks!
FYI – its not that i need to lose weight, I just want to be able to do some cardio in the house – as it is where i spend most of my time!
I have fitness dvd’s already, but want a bit of equipment …