Many thanks for your enquiry.
From the information you have provided I would recommend taking a look at our KAMEI Husky and CRUZ bar package deals. You can view these on the following list:
These are really popular budget package deals that include the roof box and a set of CRUZ roof bars, as well as a FREE roof box hoist. CRUZ make the best quality mid-market bars on the market, a modular system with separate adapter kits, i.e. when you change car you may only need a new adapter kit.
KAMEi make the best roof boxes on the planet and their Husky range offers excellent value for money.
If you're only going to use your roof box a couple of times a year - a CRUZ / Husky package deal is definitely a great value for money option.