Originally posted by Andrzej If you had a choice to start again, which system would you choose and more importantly WHY? Keep in mind the brand you would start with is a brand you would stay with (because of investment in lenses) and you could only upgrade the bodies.
K-x with 18-55 and Tamron AF 18-200mm f/3.5-6.3 XR Di II LD Aspherical (IF) Macro Zoom Lens for $750
Are there lenses similar to Nikon 18-105mm and Canon 18-135mm for Pentax?
Canon T2i with Canon EF-S 18-135mm f/3.5-5.6 IS UD for about $1150-1200
Can it autofocus during movie mode?
or
Nikon D90 with 18-105mm kit lens for about $1000
Is D90 worth the extra $250 over K-x? Why/Why not?
You've got to stop doing that, as you'll end up with a bad-as$ headache...
First of all, forget about AF during the movie-mode in any DSLR produced to the current day... even if it's marked in the "features-list" it's not usable as it's just too damn slow....
As much as I like Pentax and Nikon while having a certain sense of hate towards Canon... Among all your choices, considering you needs and level of dSLR knowledge, I'd suggest going with the T2i (baby-7D) and 18-135 combo... It looks like a really nice, tight body with a lot of nice features.... wish Nikon was making something similar, but they seem to be way uptight in their on marketing politics that nobody seems to understand besides them-selves...
Although I'd still go with a Nikon body + 18-200VR as a "one lens-solution"... After a while, if you'll get more serious about photography, you'll understand that your system has to be build around lenses... and not around bodies, as all the camera bodies of the same level offer just about the same features and IQ...
That being said, If you're on a tight budget, a K-X body will serve you just as well if not better... although lens-wise you're a bit more limited... No Pentax has nothing to offer comparable to Ni/Canon's 18-105 and 18-135.. and Pentax 18-250 is still only a re-badged Tamron... and re-badged Tamron is still only a Tamron...