Vim Ctrl-Space Omni & Keyword Completion

Ctrl-X Ctrl-O and even Ctrl-P are pretty awkward for me, so I use the following mapping:

" Ctrl-Space for completions. Heck Yeah!
inoremap <expr> <C-Space> pumvisible() \|\| &omnifunc == '' ?
            \ "\<lt>C-n>" :
            \ "\<lt>C-x>\<lt>C-o><c-r>=pumvisible() ?" .
            \ "\"\\<lt>c-n>\\<lt>c-p>\\<lt>c-n>\" :" .
            \ "\" \\<lt>bs>\\<lt>C-n>\"\<CR>"
imap <C-@> <C-Space>

This makes my fingers much happier.