Originally posted by Hattifnatt I will go for a Pentax (despite all my friends yelling to go for Nikon)
Nikon is fine but there are many compelling reasons to go with Pentax, in my opinion (and most people here will of course agree
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Originally posted by Hattifnatt I will have the warranty in another country, is that correct?
Usually Pentax honours an international warranty of one year.
Originally posted by Hattifnatt I specifically plan NOT to use auto and shoot a lot in low light. Mostly landscapes. Would this justify picking the K5II over K30?
If you plan on shooting at high ISO values, then yes, otherwise not so much.
Originally posted by Hattifnatt I decided to start with the kit lens (18-55 WR) for a while and experiment with it
That's sensible, it's inexpensive, reliable and will let you discover which focal lengths you enjoy using.
Originally posted by Hattifnatt I have come up with the idea to add a filter kit (UV, ND and circular polarizer) and a cheap tripod. Is this a sensible plan?
I never use a UV filter on my lenses except on my 50 since it came equipped with it. I got one with my 60-250 and never used it, I fear it will degrade the IQ. A polarizer on the other hand is quite useful and I use the few I own quite often. A ND filter is a specialized item, useful for longer exposures (I use mine for flowing water effects). You could also use two polarizers (the first being linear) to get a fully adjustable ND filter, going from 1 stop to completely black.
Originally posted by Hattifnatt I'm not sure whether or not do I need to add a trigger, or I can just use the camera's timer
A wireless remote is useful in some circumstances, you can get one for 2$ on eBay. A wired trigger is less useful with modern cameras where the bulb mode keeps the shutter open until you press back again, but you do risk moving the camera slightly for long exposures. Again 2$ will get you one.
Originally posted by Hattifnatt I'm also considering getting the cheap DA-L-35mm-F2.4-AL pretty fast after the kit lens. Would that be sensible? as I said, I'll be doing landscapes and architecture mostly, I don't pretty much care about portraits and range.
It's a very good lens by all accounts. You might want to wait just a bit until you decide which focal length you enjoy as I said, and maybe you will want to spend money on a higher-quality lens, like the 35 macro limited or the 21 limited (a wonderful lens for landscapes).
Originally posted by Hattifnatt maybe I need a fast card, considering that Im planning to shoot RAW only and do the processing? or is it the case that any card will do?
Yes, get a fast reliable card (or two) you will not regret it. It's better to buy two lower-capacity cards than one large capacity card.
Welcome to the wonderful world of Pentax!