Not quite a beginner myself but posting for my partner. I've recently got my Girlfriend invloved in cycling using my old bike. She now want's her own bike but I've looked around the web and all ladies bikes come with 8 speed gear sets. the budget we have is around £500 but would like to get at least 9 speed if possible (Shimano). She is 5'10, are we better off getting a mens bike with a shorter stem?