One of the most highly rated vacuum cleaners for cleaning power is the Miele S 7580 Premium Class. The Dyson DC41AN Upright Vacuum is also highly rated as well as the Riccar Deluxe Brilliance. The latter has strong suction not only in the vacuum, but also in the hose portion.
Suction and cyclonic action are arguably the two most important factors to consider when purchasing a vacuum. Air watts utilized by the vacuum are the best way to measure the cleaning and suction power of the vacuum. Bagless models of vacuums also provide greater suction power, since bags cause minimized suction power as the vacuum bag gets full.