Minimum monthly spend for $650 flextab?

[Gertie]

Out of contract a couple of months now. Looking to get a new handset. Looking at:

Samsung Galaxy S6 - 32GB
$99.99
on select 2-year plans
$749.99 month-to-month
YOU SAVE $650.00

I have "Talk & Text w/1GB Data " which is nominally $65.
How much of a tab can I get while retaining my current plan ?

65.00 Talk & Text w/1GB Data
(unlim minutes,unlim text,shared data)
-15.00 Savings: Monthly Service Fee
- 6.00 Savings: 12% Off Better Choice Bundles
12.00 Unlimited CDN LD
-6.00 Savings: 50% Off Cdn Long Distance
===============
$50+tx

Last time I was out of contract 8 months; it was near Christmas when they offered me the Note 3 at $0 + Gear at $50 and no need to change plan. I though that was a good deal.