Lenovo 1450ABU is a budget notebook with a 15.6 inch display and is targeted at the student / business market. Unlike Lenovo B470 and some other latest lenovo notebooks, it comes with an AMD Fusion APU.
Lenovo B470 is an affordable notebook that can be used for both business and school work. Powered by the new Intel Core i5 2410M processor, it sports a 6-cell battery that provides up to 6 hours of continuous runtime. B470 has an excellent keyboard and touchpad but is being criticized for its low resolution display.
Lenovo Y570 is a for those who yearn for something little more powerful than the G-series Ideapad but still want a notebook within budget. The Y570 is powered by an Intel Core i7 quad-core processor and mighty Nvidia GeForce GT 555M GPU.