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Upgrade path and price from exchange 2003 and office 2007

I need your advice on choosing what upgrade option is better for this environment.

Current:
exchange 2003 std
GFI MailEssential
mailbox 80
office 2007

upgrade:
Cloud based office 365 or on-premise exchange server upgrade to 2013 and office 2013?

-We do regular mass emailing to about 3000 clients, it usually takes about 30-60minutes to send them all. If Office 365 is the choice, do I have this mass emailing feature?

-What about spam filtering? Is there administrative console provided by office 365? Is it flexible to adjust to our business specifics?

As of doing some pricing, I don't see benefit of migrating to office 365... after 3 years when I upgrade system  to on-premise setup:

Office 365 Small Business  (Outlook only, I guess):
$5/month X 80 X 12 X 3yr=$15200 after 3 years.

Office 365 Small Business Premium(Outlook+desktop office):
$15/month x 80 x12 x3yr=$45600 after 3 years

Comparing to On-premise exchange server 2013 +office 2013:
$700(Exchange server software) + $70(user cal) x 80= $6300
$200(office 2013 home and business) X 50 = $10000
Total: $16300
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David Johnson, CD
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5 yr Exchange on premise:
6000(server hardware)+a(disk replacement)+1000(win2012 std)+70x80+700(exchange server)+700(GFI mail essential)x5=16800+a

5 yr exchange online:
4x80x12=19200

I think using exchange online makes sense.
If you use exchange online, do you have any problem managing it such as modifying antispam rule suitable to your business. For example, I use regular expression a lot.
It supports regular expression.
In your scenario above, are you willing to accept the downtime that any failing component will cause? When you start adding components for LB/HA, things get real ugly real fast for any small shop. While in EO, you get this by default, and with financially backed SLA. Which of course is not to say that issues don't happen.

You have a lot of customization options with EOP, including use of regular expressions. Just review the article I linked above.
I agree. I think I have to look more into Exchange Online and test.

Thank you all.