Hey WD: That's cool...I think it's a good choice and it will serve you well for many years.
Now as to extras
Wattmeter/SWR bridge: The 450 has one built-in, but like most of us I prefer an external one between my radio and antenna.
http://www.randl.com/shop/catalog/product_info.php?cPath=8100&products_id=38651
You will need one of these below between the meter and radio. Then your antenna will connect to the other port on the wattmeter
http://www.randl.com/shop/catalog/product_info.php?products_id=61385
Power supply to run radio:
The FT-450 has an operating voltage of 12-14 volts DC
(Just like your car). So with this for house operation you need to convert 120 volt AC(your USA outlet voltage) to 12-14 volt DC.
Examples:
http://www.12voltpowersupplies.us/
This company is a sponsor and member of this website...
The SS-350-12 is a good basic supply and VERY reasonably priced...it has enough power to supply the FT-450.
I think you find many good reviews right here on this site.
These are other examples:
http://www.randl.com/shop/catalog/product_info.php?cPath=9110&products_id=50193
http://www.randl.com/shop/catalog/product_info.php?cPath=9110&products_id=30686
Again I like meters!
COAX: To go from station location to antenna...this is good for all HF bands 10 meters and below and can be purchased without connectors in various lengths or with connectors attached once you figure how far from radio to antenna that distance is needed.
http://www.randl.com/shop/catalog/product_info.php?cPath=11020&products_id=19423
This type is good for HF.and VHF antennas...little more expensive, however covers greater frequency range with less signal loss.
Again can be purchased in bulk lengths without connectors or with connectors already installed.
http://www.randl.com/shop/catalog/index.php?cPath=11110
Now WD: You'll notice most of my Links go to same place.
R & L electronics...This is certainly NOT the only vendor to get these products!
However I have dealt with them for many years and Roger (owners Son)and their staff are good people, and normally very competitive on their pricing and customer service!
Here are links to other good vendors:
https://www.dxengineering.com/?gclid=CJP0itSzsLsCFQISMwodnDoAFA
GREAT source for antenna parts is DX...some of my antennas are built using their fine products!
https://www.dxengineering.com/search/department/antennas/section/wire-antennas-and-parts/product-line/dx-engineering-ez-build-uwa8x-center-t-and-end-insulator-kits?autoview=SKU&N=4294953330+4294953299&sortby=Default&sortorder=Ascending
http://www.hamradio.com/
These both have good products and good reviews from customers
OK did I overload you again...Sorry just trying to get you going the right direction
Young Jedi
All the Best
Gary
