In answer to frozendreamer's OP, to be honest, I don't think I've ever seen a strobe airborne in VMC before I saw the aircraft they were mounted on. Maybe they subconsciously attracted my eye towards them, but I tend to think of them as a fashion item.
Doubtless others will disagree.
It may be that you've caught them in your peripheral vision first as it's more sensitive than the central area of your retina.
I think navigation lights could as you say be regarded as a "fashion item" but surely anything that helps to be seen and avoided must be worth fitting?
Dont discount Xenon strobes as good ones are incredibly bright and shouldn't interfere with radio or intercom if installed correctly.
Also, maybe consider an LED landing light. I've got one. It's very bright and I tend to have it on all the time.
I count them all as insurance, but I'll probably never know how well they work. IMHO better to fit and be seen than don't fit and regret it later.
Could you get any owners at your airfield to help by asking what to they've got fitted and do a visibility comparison from a distance? That might help narrow down the choice.