Very nice collection you have!!!  I like that you posted your 2 power nozzle canister vacuums first.  Both good choices.  I've tried both.  The Panasonic follows the design of the original Kenmore Progressive that came out about 15 years ago when that CenTec designed CT18DXQD power nozzle emerged.  That Panasonic is one of few canister vacs on the market today to carry a nice 4 piece full sized tool set on the market.  Your Panasonic is MC-CG902.

The Kenmore you have is a gorgeous red Kenmore canister.  They are quiet, good performers that perform even better if it had the same tool set as the Panasonic next to it.  Though the PowerMate Jr. included on this model is a nice addition.  The wheel design on that Kenmore is great.  The machines roll very smoothly over just about any surface with the rubber coated rear wheels.  Despite being bulky I do like the dusting brush on those, they are fantastic for hard surface steps.  The upholstery nozzle part of that combo tool that comes on that Kenmore is very small, it disappoints me.  Depending on the cord length and hose length of your machine, that red model would be  a 116.25512 or 25513.

Do most of your Hoover Elite styled machines to include your red Convertible and teal Tempo have the single row brush roll?  Oddly enough with Elites the T shaped head which is the design I like better was their more no frills line and the higher grade Elites were the square heads.  All of the square head models I believe had the dual row brush roll 48414081.  Some of the T-shaped heads had the dual row but others were originally with the single row 48414079 brush roll.  Many of the T shaped heads were 7.0 Amp  14.5 or 16.0 CEA rating.  Where as many of the square heads were 7.2 Amp, 17.0 CEA with TurboPower 2200 having an 18.0 CEA rating.  I like the styling of the T shaped heads like yours better! 

What do you think of the Hoover Agility SteamVac?  I've tried all of the traditional style Hoover Steamvacs to include a Stationary brush model, 5 brush and 6 brush Widepath.  I've also tried one 5 brush V2 model.  Haven't tried any others.  I love the traditional Widepath model and wish one was still made today!

Do you have any more power nozzle canisters?  I love power head canisters.  I grew up with Hoover ones primarily and got used to the raised button design, I love them the best.  Especially love the utilization of the red rubber groomers that Hoover used on their canister upholstery nozzles.  If you haven't tried a Hoover canister, then you need to some time!!