Ive found the same with Jodi Piccolt, same structure each time and feels pretty repeatitive once you get 5 books down the track!
My favourite author is Belinda Alexandra. Have just finished her book called Tuscan Rose, very good. Her others are
White Gardinia, Silver Wattle and Wild Lavender.
Jennifer Donnelly is another great author, her books The Tea Rose and then the Winter Rose are amazing.
Light hearted I agree with the Bounty Hunter books, can read those books quickly.
And Lastly - The Bronze Horseman by Paulina Simmons is great, one of my favourite books and have read it 3 times - HOWEVER - the rest of her books that have come afterwards seem like they are written by a totally different author. They are crap and it really doesn't seem like she could have written such an amazing book and then only had crap to write afterwards