optimal vimrc and plugins for fortran, latex, c and html

Dear Friends,
I work on (g)vim mainly for writing codes in fortran, C and Latex (and my webpage in html).
I am using fortran code complete (http://www.vim.org/scripts/script.php?script_id=2487) and vim-latex(http://vim-latex.sourceforge.net/).
I know about omni but not yet managed to use it for autocomplete my codes.
I am looking for some suggestions on plugins and an optimal vimrc for better productivity.
My present vimrc is:

set autoindent
set smartindent
set incsearch
set ignorecase
set smartcase
set novisualbell
set paste
set ruler
"set expandtab
"set smarttab
"set shiftwidth=3
"set softtabstop=3

syntax on
colorscheme MySlate
"set mouse=a "enable mouse
set nu "show line number
"set cul "highlight current line

if version >= 700
set spell spl=en_us
set spell
nmap <F12> :set nospell!
endif

" Fortran stuff
:let fortran_do_enddo=1
:let fortran_more_precise=1
:let fortran_free_source=1
:let fortran_have_tabs=1
autocmd BufNewFile *.f90 call New_Fortran_File()
fun! New_Fortran_File()
:0put='!This is file : ' . expand('%')
:put='Implicit None'
exe ":3"
endf
filetype on
filetype plugin on
filetype indent on

set sw=2
set iskeyword+=:
"latex only
let g:tex_flavor='latex'
" Always jump to last edited line
if has("autocmd")
au BufReadPost * if line("'\"") > 0 && line("'\"") <= line("$")
\| exe "normal! g'\"" | endif
endif

:nnoremap <Leader>lw :up!<cr>:call Tex_RunLaTeX()<cr>
":echo 'Current time is ' . strftime('%c')<CR>
autocmd FileType html set omnifunc=htmlcomplete#CompleteTags

I am using vim 7.3.712 in fedora18

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