I have flown the Embraer 145 in Brasil. 4 flights.

Walking onboard, and turning to face the aisle, the luggage bin configuration was only on the starboard side. There is only one aisle, with single-seating on the port side, and double seating on the starboard side.

We have exclusively used Rimowa Salsa Air 4-roller, and a Rimowa Porsche 2-roller as carry-n. Both fit easily, with slight room for a coat, and an attache.

Attached is a link to a US website with pictures and a description, which I hope may be helpful to you.
http://www.tomzap.com/embraer145.html

Newer aircraft models, at least in Brasil. Good, stable, relatively quiet flights.