You can definitely get external scalers for $2,000 and more, but you can also find a good selection of scalers from $200 to $600 and on Amazon plenty of them can be had at good discounts.
http://www.amazon.com/s/ref=sr_nr_i_...%3Aelectronics
Once you find one that works with 1080i60 to 1080p60, you're golden.
From Gefen's website they have this little beauty for only $299.
http://www.gefen.com/kvm/product.jsp?prod_id=4722
Product features:
Quote:
Features:
Digital input is format converted and pixel re-scaled through the HDMI 1080p Scaler. It outputs a large range of formats and resolutions that will easily match the native resolution/ format of your display to ensure highest picture quality.
DVI/HDCP/HDMI compliant input: Operates up to 165Mhz (Up to UXGA @60Hz)
Supports digital HD output up to 1080p.
Integrated DVI/HDCP/HDMI compliant receiver.
Dual high quality scaling engines.
Dual 3-D motion video adaptive deinterlacers with smooth low-angle edge.
Automatic 3:2 pull-down & 2:2 pull-down detection and recovery.
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Supports loads of inputs including 1080i60 and outputs at 1080p60.
It has HDMI 1.2a, but as it would only be used with cable, that's all you'd need.
EDIT - I just sent them an e-mail to ask if it goes 1080i60 > 1080p24 > 1080p60. If it does, might be a good solution for lots of cable/satellite 1080i users who aren't watching the full 1080p signal that's being delivered to them because of poor 3:2 cadence. $299 is not much to pay for 100% increase in resolution, although Toshiba fans may disagree.