I personally still prefer vacuums that use bags because most bagless dirt containers are so small. I never make a mess changing a the bag (because I don't wait to change it until it's so full it's about to burst), but dumping a dirt cup in the trash always results in a small plume of dust for me, and I need to deal with it 4x more often.
Another thing I don't care for on bagless vacuums: False economy--you don't need to buy bags, but air filters on bagless vacuums are mandatory, and they require periodic changing. Additional air filters on bag vacuums don't clog as quickly, and they're optional because the vacuum bag already provides the first level of filtration. If the optional HEPA filter on your bag vacuum clogs, you can get away with running the vacuum without it in a pinch.
BTW, I have a Sharp EC-TU5111 that I paid a little under $200 for, IIRC. It has quite a few useful features, plus lots of metal parts and a ball-bearing motor and brush, so it should last a long time. (It's from Sharp's "next step up" non-commercial product-line, not the all-plastic cheapie product-line.)