My Erlk would vape extremely well on the P2.5 and look good to boot. I don't own any button-tops. For me, buying a ProVari is buying into the brand/system. I've been considering a Kabuki. So, P2.5, P3 flat top, batteries, etc $250. Not sure I'm ready to commit that much cash for what this is. I may get a clone Kabuki first to see if I like it before I commit to the BEAUTIFUL Ti Kabuki ($150).
My VTC Mini is the nicest piece of kit I own. I rotate my Erlk (clone), STMini and LEMO2. In almost 2 years of vaping, I'm about $700, all in, INCLUDING all vliquid/DIY supplies. If the "deeming" turns out to be very oppressive, I think I want a few nicer pieces that I can be a bit more confident of lasting me. TBH, if it weren't for deeming regs, I don't think I'd currently be shopping. I'm pretty happy/satisfied where I am right now. Fear is causing me to panic-plan/shop. I don't like that at all.