The biggest issue for me with a 180 is how long your arms are. I can reach the substrate in the back, so I can plant stems and 'weeds' (Crypt. spiralis is one) in the back, but if not, make the back for semi-permanent plantings like large swords.
A 180 is a true empty palette. I have had mine since the late 90s and have probably recreated it once a year. Always room for something new (plant, hardware or fauna), keeping the hobby fresh. It is a lot like a garden outside, lots of acreage! And a good, stable water mass to hide a lack of skill (talking of myself now!). And a layman or hobbiest is always drawn to it. Good choice.
My suggestion? Go to the for sale area here with a set budget and buy everything that catches your eye for a week and plant it. Some will thrive, some will survive, and some will die. Then rearrange as you find what works for you. The aforementioned spiralis is a weed in my tank, in a friends it dies. Yet he has a parva mat that I would kill for, and I have a sprig that just sits there, motionless, taunting me. Go figure. That is why I like the shotgun approach!