If you just want to add the functionality of a remote but have no other issues with your head unit, there is also this an an option. Keep your current head unit and add this:
KRE-502E
Item is available.
Price: GBP£ 59.99
http://shop.alpine.uk.com/products/productdetail/KRE-502E/part_number=KRE-502E/9280.0.4.3.0.0.0.0.0?By using the KRE-502E it allows you to control a Non Remote Control Ready Head unit via a remote control. The KRE-502E uses the Steering Wheel Remote Control input on the rear of the Head Unit.
Caution:
You can’t use the KRE-502E in combination with an Alpine steering wheel control interface!
and you can order the remote there as well:
RUE-4202
Item is available.
Price: GBP£ 29.99
http://shop.alpine.uk.com/products/productdetail/RUE-4202/part_number=RUE-4202/9280.0.4.3.0.0.0.0.0?Head unit remote control for all ‘Remote Ready’ head units.
Recommended Accesories:
By using the KRE-502E it allows you to control a Non Remote Control Ready Head unit via a remote control.