I'm not sure how to read your point about 'a knife for now or a knife I can grow into'. I mean, shouldn't a good knife be nice to use right from the get go?
Well there are all kinds of levels to knives, kitchen as well as EDC. Some people believe in buying something more fitting to their current levels, while others buy knives that may be above their skills. I have certainly done the latter, but I'm not telling you how to spend your money, just telling you things to consider from my perspective. A Teruyasu-Fujiwara or Takeda gyuto will set you back some dollars, but will be a hell of an experience.
Yes, you should keep your current knives. Thin knives with acute angles are terrible on hard things - crusty loaves, contacting bone, frozen food, or a bad angle on winter squash for example.
You can go cheap with the paring knife - many pros suggest it and do it themselves. Unless it is one of your main knives, you aren't getting dollar value for it That said, the Shun Classic paring knife is great in the hand.
For a short main knife, I guess your looking at no longer than 8" or 210mm. There are 180mm gyutos and shorter chef's knives, but for me there is too much curve. Certainly a santoku should fit your stated style while being good for a smaller work space.
If you are looking in that size range, consider the bano bunka. While the santoku is a large wharncliffe, the bunka is a large coping blade and gives you more if a point to work with.
If you are a push cutter, something flatter with less belly works better for you than the big belly of a traditional German. In that case the French Sabatier fits your style more, although the German companies have ironically moved towards the French style. The best of the sabatiers in current production (the name is not trademarked) are the K Sabatiers.
The best Germans are the Wusthof Icon. The German knife that may best fit you is the Zwilling Pro - do not confuse this with the Professional S, a totally different blade.
For the price of an Icon, I think there are far better Japanese knives, but we can talk further after you look at more things.