I think Ortlieb are the best really. If you are going to use them and will get your monies worth then I think they are a good investment.
If however they are just going to be used for a few days per year I'd go with a cheaper option.
Ortlieb are nice, but I can't see spending more on the bags than I did on the bike...
(true I got it new/used, but still.) My brother uses his Topeak daily and though they weren't super expensive they have held up well, he even recommended them to me but I wanted something a bit more stylish. I'm sure Ortlieb makes glorious products, but really nice ones can also be had for less and still used every day. I, like mjr, am also not big on rolltop bags (too much fussiness.)