I wouldn't call anything Hermes "entry-level" but if I HAD to pick something, I would say that a picotin (MM size is my favorite) is totally adorable, user-friendly and, all things being relative, reasonably priced.
You can't really go wrong with ANY of the bags. For shoulder-carry maybe an Evelyne?
They are all great bags and it's almost like asking which ferrari is "entry-level" LOL!
Good luck with your first purchase!
I say, pick the style you love that will suit your lifestyle and THEN shop around.
As recently as this morning, a top ebay reseller had a Buy It Now 35 cm GHW Birkin for under 5k.
ITA with AuthenticLux! good luck!
some of the resale prices I have found since November 2008 to now include
BBK 28 sellier 2K usd
porc 28 sellier 1,600 usd
black evelyne togo GM 699 usd
barenia toile evelyne pm 799 usd
rouge H shoulder bag, bamboo toggle, never used, 499 usd
tsako, leather toile, 239 usd
2 box jige pm's and 1 evergrain jige pm (799-900 usd)
check the recommended reseller list and finds threads