I'm a huge gear whore and waste way too much money on gear. I too like to have the cream of the crop on in my rig; however, I must defend Blackstar because I owned their Series One head an it was of a high build quality and extremely good tone. I also owned an HT100 which I dropped, kicked, and banged up for a couple of years and never failed me once. I'm definitely a snob when it comes to *where* something is made, and my usual preference is USA, Japan and UK. I rarely make exceptions and that's mostly due to a lack of choice, but Blackstar has proven themselves as a quality builder and I'd recommend the Series One to any boutique amp user.
Anyway, I have some excellent suggestions for you. Check them out and I'm sure you will find what you're looking for in one of them. However, it sounds to me like you may need to consider a couple of things first. I think the Nova Drive is incredible, not just because it has incredible tone, but also because you get the real analog OD/Dist. but with digital features. If you're not getting what you want from it then maybe there's something within your setup that needs a little tweak.
I don't know what amps you're using or how you're running your distortion, but it sounds like you are probably mainly using OD/Dist. on a clean amp. I personally prefer using an OD at the lowest settings (kind of like a clean boost), and leaving it on when I switch to the clean channel. It doesn't add much grit to the clean channel and it helps the clean stuff cut through. It's simple and the only switch you need to step on is the channel switch. The OD just stays on all the time. Then again, I buy high-end amps because I want to get the most desirable distortion without pedals. I purchased a Bogner Goldfinger 90 a while back because it has plenty of gain for most applications, but is also built with pedals in mind. It has 2 FX loops, one for OD/Dist. pedals and the other for modulation effects and stuff. It also takes pedals through the input extremely well and very low noise.
So if you still aren't getting where you want then the T-Rex Dr. Swamp is awesome. It has a dual setup and goes pretty much from light boost to pretty heavy distortion. It sounds great. It has a top end sparkle that makes it sound brilliant, but the tone knob can darken or brighten it to your taste. It has kind of a similar distortion to the TC stuff. Next, I'd recommend a Bogner XTC RED or Uberschall pedal. They are really well built and sound incredible of course. I have the RED pedal and it's very versatile. It goes from light OD to pretty heavy distortion. The Uberschall is a bit more versatile than most people realize, but it gets brutal. I also have an Xotic BB Plus which has 2 channels. They sound different from one another and can be blended. It's a fantastic pedal once you get the hang of it. It also allows you to control the compression so it sounds better with different setups. Then there's the Guyatone Mighty Micro Hot Drive which I really like. It's warm sounding pedal with several options. It can even do some fuzz stuff if you set it that way. It's a real good quality and the OD/Dist. sound amazing. You can tap it for PLENTY of distortion if you desire.
T-Rex Dr. Swamp
Bogner XTC RED or Uberschall pedal
Xotic BB Plus
Guyatone Mighty Micro Hot Drive