You're speaking in contradictions, so it's a bit confusing at times
Anyway, lets start at the start. The photos you want to take.
Landscape and architecture require wide-ish lens with low distortion. The sensor needs to have good dynamic range and as weak an AA filter as possible. And most importantly of all you need a good tripod.
A good tripod and head will probably cost near to £1000, but you don't mention what your budget for the tripod is. You could do worse than to copy our resident landscape expert (kushtibari) and go for a Gitzo GT3541LS with a Kirk BH-1.
Lens.. probably aim for something around the 28mm range in 35mm equivalent, so if you're on a 1.6x crop factor sensor there are good 12-24mm wide angles (nikkor 12-24 f/4 G, pentax SMC 12-24 f/4, tokina 11-16), or 9-18 if on 2.0 crop (olympus 9-18).
Body - do you need weather sealing? If so Pentax are great value for what you get, and the K30 looks sweet. They're pretty good landscape cameras anyway, but you wouldn't go wrong with any high resolution camera from Nikon, Sony or Canon either.
Portrait shooting, on the other hand, almost requires the opposite. If you're doing this pro then you're going to need a couple of cameras anyway, so I'd suggest building a different system for the portraits - if it happens to be the same brand then cool, but don't worry if not. A tripod still comes in handy for a portrait so the Gitzo won't go to waste, but the most important thing is lighting so getting a good strobe setup is handy (multiple flashguns, reflectors etc.). Again you don't set a budget for this kind of stuff, but it'll be several hundred. I know less about that kind of stuff so go nag our resident portrait expert (bob).
Lens-wise for portrait you need something fast and usually somewhere around 85-100mm (35mm equivalent). Primes are often a good idea because they're usually faster than zooms and can be optimised optically more easily. Others will have to chime in about specific lenses as I only know about ones for my system which you can't really buy anymore.
Sensor wise resolution and dynamic range is far less of an issue for portraits, but you want good colour accuracy and to avoid moire.. which often means you want a sensor *with* a fairly strong AA filter or that is otherwise not subject to the failings of the bayer sensor. If you can go full frame then you get the most benefit for portraiture
IMHO.
Close-ups can sort of be handled by either of the above - again tripod is very handy, light is also important, but here you might want to start looking at low noise/high ISO capability, so go for a camera with a large sensor and/or fewer megapixels as a very rough rule.
I've not really focused on makes, because it's largely irrelevant - as long as the system has the lenses/accessories that meet your needs. They all do, so go for whichever body fits your hands/operation most comfortably.
Software wise, lightroom is a great tool for less money than photoshop. If you're going pro though I expect you'll find some business budget for the full photoshop experience.
TL;DR: Pro level stuff is expensive, but you're a business, it's a business expense. A good tripod is probably the most important bit of equipment for your uses so budget for that accordingly.