I've got the Canon 450D, this is not a 35mm equivalent, it has a cropped sensor, any lens you put on it gets you a 1.6 times magnification.

So, I use:

A 50mm f1.8, the cheapest one. Great during the night in Bangkok or Pattaya.

The 10-22mm EFS, great for wide-angle shoots

The 24-105mm L, great for the street walk.

I'm missing the 70-200mm sometimes...

What are your recommendations?

And well, for you to judge, one picture with each of these lenses

50mm - Pattaya

10-22mm - Suvharnabumi airport in Bangkok

24-105mm - South Sathorn Road in Bangkok

I do have 5 Canon L lenses and some of them are really recommendable but they are all designed for full-size sensor cameras (as most if not all L lenses are), so I'd think they are of little value to cropped sensor camera. I'm surprised you have 24-105L. I have it too and it's among the least I like of the 5 but one I use most especially on trips. I would imagine it is of little use for cropped sensor cameras except it will crop the very distinct corner vignetting it creates at wide angle that makes the lens undeserving of L status, if you can't be bothered to correct it. You may be disappointed with the lens if you upgrade your camera to full-size.

You may be disappointed with lens if you upgrade your camera to full-size.

What I read about it indeed.

But I won't problably upgrade to full-size for quite some time.

My next one will probably be the Canon 7D, so that I can use all the lenses...

Canon 40D with the EF-s 18-85mm

10-22mm EF-s

70-200mm F4 EF-L IS

28-70mm 20 years old, but very light and useful for candid indoor shots

Your selection seems good to me - you can go on buying stuff forever but you shouldn't miss any shots with what you've got. The 70-200 2.8 IS would be a good next step after you upgrade the body and a 7D or 5DMkII or even a used 40D would show a worthwhile improvement over a 450D.

Agree with "Greenside"

Biggest problem I encounter is that I have TOO many lenses. As such, I always seem to attach the wrong one for the situation!

As I shoot mainly low light and street type stuff I prefer primes i.e. 24 F1.4, 50 F1.4 and 85 F1.8.

The latter at F1.8 is a bargain lens in the Canon line-up. Sharp, contrasty and cheap and nigh on as good as my 85 F1.2 L

On a 1.6 cropped sensor this would equate to 136mm - the optimum portrait FL - wonderful OOF (bokeh) as well

Worth a look I would think

95% of the time I use the 17-85 EFS, USM, IS.

Occasionally use the EFS 60mm macro.

I have a 70-300 EF zoom, but I rarely use it.

I have crop Canon Cameras (7D and 40D) and quite a few lenses ...

The 10-22 EF-S from Canon for Wide Angle.

The 17-55 2.8 IS as a standard lens. I tried a few others, but there is no replacement for the length among full frame lenses that is better. The 24-105 4.0 lacks Speed and Wideangle, and the 24-70 2.8 has also no wide-angle and is missing an IS. Also after trying out both, I have to say that my 17-55 is sharper and generally better than the 24-70.

Plus I have the 70-200 4.0 IS, which is a great lens, and not taht heavy and bulky.

Plus the 1.4 50 mm, 1.8 85 mm, 2.0 135 mm (Possibly the sharpest lens on the planet!) plus soon the 300 mm 4.0 IS.

And I love my Lensbabies!

I see no reason not to use full format lenses on crop cameras, only in the Wide Angle theere are limitations. Both the 16-35 2.8 and the 17-40 mm 4.0 are not that great, and on crop the Wide Angle is limited.

I have crop Canon Cameras (7D and 40D)

A bit off topic but you bought the 7D recently and had been having the 40D for a long time.

Your verdict, was it worth upgrading?