I've got a pair on the 184 last in two-tone calfskin, with pebbled burnt pine covering all but the strap (the strap being smooth dark oak). Honestly, I don't wear them much as I should - it may be the 184 last, but I prefer a longer vamp than the shoe has. Other EG loafers, such as the RLPL Longacre on the 100 last, have a much longer vamp. With the shorter vamp, I also think of them as warm weather shoes, so they get put away each fall for the season. FWIW, I got mine on Ebay, used very slightly, for about $150. I think you'll find that EG loafers on EBay have a hard time selling for the prices the lace-ups demand. Brand new EG loafers seem to sell in the $200-400 range, depending on the loafer model/color/last, whereas new laceups sell more in the $350-550 range. Black shoes always selling for less than brown.
As for "grades" mentioned in your question, EG had a Top Shelf grade for a few years, but they no longer do (stopped in late 90s I think).