I'd highly recommend an Eastman 305.

If you don't have a local shop that does good setup work, call Vince @ The Mandolin Store - www.themandolinstore.com and he will get you set up.

Make sure to order some picks that are good for mandolin playing, like some Dunlop Primetone Tringle Picks:

https://www.amazon.com/Dunlop-Primetone-Triangle-Sculpted-Plectra/dp/B00TVFYE2U/ref=sr_1_1?dchild=1&keywords=dunlop+primetone+triangle&qid=1605543111&sr=8-1