I don't have one, but will be getting one.

Can anyone recommend one that sucks (good), or ones to stay away from that suck (bad).

I'm thinking cordless for sure, either rechargable, or 12vdc.

 

In my personal experience every hand-held or cordless vac I've bought has really sucked (bad). They just dont have enough power to suck (good).

I've given up on trying to find one that sucked (good), and recently just bought a very small ShopVac which totally sucks (good). Its very light and has wheels, so I can just roll it around the car. And the nozzle tube is plenty long to reach all the interior areas. Then I just bought the "detailing" nozzle kit to go with it, which has all the tiny nozzles with brushes and stuff like that.
An added advantage is that its very durable and easy to clean out.

 

Same thing here too Scaf. All the ones I've tried that are portable really don't suck hard enough (in a good way ). I use a big shop vac that is on wheels and it does a nice job.

 

1000 Watt Super big shark available at Sears. It's compact and has pretty good power. Plus it comes with all the little gadgets to make cleaning corners and tight spots pretty simple.

 

I have a Vac'N Blo that is somewhat portable and it does a great job. I particularly like the 6 foot hose and 12 foot cord.

Vac'N Blo also has a wall mount that supposed to have more sucking power, but I haven't tried that one.

Got mine at www.properautocare.com. Just looked and they now have a Vac'N Blo Junior.

Vac'N Blo