Depends what you consider entry level, also do you want just OTL or are you okay with hybrid. Is the Crack entry-level price for you? It's pretty expensive considering how many cheaper options are out there nowadays.
I'd say sub 200 and everything taken into consideration, ie. availability, warranty, customer service, tube rolling, sound quality, versatility, etc the Vali 2 is pretty much unbeatable. That's just my opinion though, it works with planars and dynamics, I have personally heard it with 400S, 400i and 500s and it performs a lot better than you'd expect for the price (like $150).
I don't know what any of your headphones sound like though so far as that goes I can't really comment.