So, which cool mods should I get? I only have the high res mod for ME1, so I'm sure you have suggestions 
Well... I've modded Ash's appearance to look more like she did in ME1. I like it. Hi-Res N7 armour looks nice, as does HR EDI. There is the option to keep her visor if you wish. It's in there somewhere. ME1 style scars are awesome. Meeting Ken and Gabby in Purgatory is pretty cool, and the Zaeed mod I just installed. I've also got an extended last conversation with Anderson to look forward to. Oh I added HR Alliance combat fatigues, and buff arms for femshep. I haven't installed Garrus' HR Armor mod yet because he's dead in this playthrough. 
EDIT: Oh, also gave Alliance colors to the Cerberus Ajax Armor. Looks pretty cool.