Jimmy's Bar went into administration and has now closed. It is due to reopen as a bar/restaurant/brasserie called Monkberrys. Not sure when though!
Bournemouth has a large University population and now summer is over the stag/hen groups are all gone and the bars in town tend to be filled with freshers and students. Not sure how old you are, but if you are more than mid twenties I would recommend you head to the top end of town (west cliff/ west end area) for the less cheesy/student places where it tends to be a bit more classy, or pretentious, depending on your view! Some places are fussy about hen parties though! The main strip in town where the majority of the bars are is the loudest area, you can't walk more than a few steps without passing a club or bar.
Based on what you've said and if you want Bournemouth town centre area only I would look up:
:00 - 9:00pm - A posh, up market restaurant to seat 15 people -
The Print Room, West Beach, Funki Sushi, or
Gary Rhodes Brasserie at Kings Hotel or Captains Club (in Christchurch, about 5 miles away)
9:00 - 10:00 - A Stylish, glamourous bar, somewhere to go for a champagne toast!
1812 for cocktails ,
Klute, Funki Sushi, Hamptons, Aruba,
Bar So,
Orange Rooms
10:00 - till late - A stylish, glamourous club that plays r'n'b, house, current music -
V, Be Bar, Bar So, Bliss, Toko, Klute
Saturday, Looking for -
4:00 - 6:00 - A fun, upbeat reataurant, a place where the waiters make a fuss of you, restaurant plays music, serves cocktails etc. Somewhere fun!
1812, Aruba, Alcatraz, Cuccini's, Prezzo,
Hot Rocks
9:00 - 11:00 - pre drinks at a fun, cheesy bar that doesnt mind people being dressed up in costumes etc.
Heroes, Bar Me, Walkabout, Elements, Disco Fever, Toko,
11:00 till late - club that plays 70's, 80s, current music that allows fancy dress -
Toko, Bar Me, Walkabout, Disco Fever
have a look here:
http://www.bournemouthnightclubs.co.uk/