I think it's about time to start ordering plants. What are you thinking about getting? In my opinion Baby Tears are the best looking carpeting plant, but Monte Carlo grows the fastest. S. Repens is also another nice looking plants, and most species of Rotala look good and grow quickly.
Research the different species of Rotala. Most of them make good high tech plants. I currently have Wallichii and Macrandra. Alternanthera is also a nice high tech plant. Staurogyne repens makes a good mid ground plant; I have a bush around my driftwood. It helps transition the foreground plants (baby tears) to the background plants (Rotala, Flame Sword, Alternanthera, etc...).
Research different high tech plants and find ones you like. Tropica.com has an extensive list, and they sell every plant on it. You should be able to keep most of the plants under the medium and advanced sections.