What is the best way to capture an expiring domain name?

Many companies and registrars offer services to catch expiring domain names. A list of some of the larger players:
http://www.pool.com(com/net/org/info.../org.uk/net.uk)
http://www.snapnames.com(com/net/org)
http://www.namewinner.com(com/net/org/info)
http://www.thefirstname.com(com/net/org/info)
http://www.dropwizard.com(com/net/org/ca/co.uk)
http://www.godaddy.com(com/net)
http://www.enom.com/resellers/(com/net)
http://www.namefox.com(com/net)
http://www.dropcatcher.com(com/net)
http://www.detagged.co.uk(co.uk)

There are also many other smaller catching services and the listed drop services may catch more extensions than listed. The pricing is based on bidding or first-come-first-serve basis. Prices can vary from service to service, some cost under $10, while others start at $120. If you want the domain badly enough, cover as many bases as possible.

Got it from Webhostingtalk

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how about todaynic.com think it is your best choice if you want to invest on domains.

Code your own tool and use that tool for this purpose. In this way you will be sure that you can have total control over the features and methods of catching such domains.