HelpDesk software

Kayako is excellent however WHMCS has came a long way over the past few years and for the most part performs very well indeed.
 
What software do you recommend to use for a HelpDesk system for customer support? I'd like something that has a short learning curve and is easy for the customer to use as well. Would prefer lower cost options as money is tight at this point. I'm hoping to find a low-cost, reliable system that I will be able to install myself without too much hassle.

I think with a low budge requirements WHMCS shall be best as it can give you option to have billing system and helpdesk in one place.
 
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