Opti...let's try and scratch your itch once and for all.
You know as much about cars as anyone on here. Not the workings, but the makes, models, engine sizes, etc. You have mentioned cars that I have never heard of. So, on that point, no one on here is going to be able to suggest anything that you are not aware of.
If I'm correct, you want a big, comfortable cruiser with the ability to turn into a hooligan when necessary. There are cars like that, but they cost a fortune when new. For the money you are wanting to spend, you'll get one with high miles, that has possibly been abused and is basically ready for someone to start throwing money at it. An unmarked, low mileage, FSH would be out of your reach for that money.
I reckon you've been spoiled by the omega. A big luxury barge that's relatively quick for no money. I doubt you'd find another car that fits that particular bill.
What I do when I'm stuck is to go on the trader and look through all the manufacturers. Discount the ones I don't want. Then, from the manufacturers you would consider, look at the models. That way you may find what you're looking for, but I very much doubt it. You already know what's out there.....and, I'm afraid, it ain't much. There's nothing to get the pulse racing other than big, expensive jobs.
Get used to it.