Wendy, as all the posters keep saying, you will know when the time is right. It is perfectly normal to want to get a new dog quickly, just as it is perfectly normal to wait.
I have done both & for me it helped more when I got a dog quickly, but as some others have posted you may not bond straight away, particularly after such a tragic incident. When Daisy died suddenly, I waited 7 weeks before I got Danny and whilst I loved him to bits it took 3 or 4 weeks until I really bonded with him. When Danny died and we rescued Brodie the next day, it was instant bonding, he was everything I wanted. A Black & Tan cocker boy, so well trained, but unknown to us had an aggression problem, so when I had to return him after 5 weeks, it was actually worse than a bereavement, as I felt I had let him down, though I knew I hadn't. On the way home I checked kennel club registered breeders in our area and found Dennis. I instantly fell in love with him, but the bond took a couple of months to build up. Now Minnie, Dennis and I are a great team together. Have you considered rescuing a cocker? You may find that easier to work with. The main thing is, its your decision and only you will know when the time is right. Good luck in whatever you decide.