For the compressor, i'd suggest the TL Audio 5021, sounds heavenly with bass. I'll try and get a sample up of before/after, as i recently used one on it. I'll suggest getting a SansAmp Bass Driver DI too, as you can get some really good sounds out of it, and it's got a good DI built in, which the TL is missing.
With your speaker positioning, you want them to be 60 degrees from you, and there to be equal distance between yourself, and the speakers (so you have an equilateral triangle formed). Pay attention to how close to the wall/corners the speakers are- close to a wall, you'll get +3dB in the low end, in the corner, you'll get +6dB, and if it's in the corner on the floor (or on the ceiling), then you get +9dB. Also, being close to a wall, will factor in natural resonances from the material of the wall, which will help create this lumpiness. I'd suggest doing some analysis (you can get some software to use with a mic to check the rooms performance- it's not as accurate as a proper acousticians survey, but it's good enough for home), and once you've done your best, just be aware of what the problems are; having a bad room doesn't create a bad mix, not knowing that you do, does :)
I don't know about the order of the rest of things, but personally, the axefx would be at the bottom, i don't want a modeller :)