Congrats on passing both the Tech and General!
HF operation is the good stuff where you can catch some of the good DX and meet other people stateside. Remember in the Amateur world, DX is radio contacts off the US mainland. Right now there are DX-expeditions running in Africa in 2 countries that you could get lucky and make contact to put in your radio log.
VHF/UHF is mostly repeaters and not very interesting. It's good these are around especially while traveling but most of the day these have no activity on them except in the big cities. I think you will be disappointed if all you have is a 2 meter/440 radio.
It's usually best to spend the money once and get a nice radio than to keep upgrading, but hardly any of us do that anyway.
The Yaesu FT450D is a real nice entry level radio and if you want to take it up a level, the new Icom 7300 is one I would look at. You can always add a separate 2M/440 radio later on if you desire. If you want an all in one radio you could go with the Kenwood TS2000 or the newer Yaesu FT991A.
The antenna is really the most important thing to consider and it could be limited to many variables like costs, available space, trees, and what your neighborhood will allow or the wife.
The good news is you can get by with a $50 G5RV wire antenna for now that is a good enough multi-band antenna to get you on the air until you decide what you want. All you need is one tree or other support mast and stretch out the 2 dipole wire ends in an inverted Vee configuration or straight out if you have another tree close enough and your on the air working the HF bands from 10 thru 80 meters! However I don't recall if most HF radio's built in tuners have enough range to tune every band for the G5RV. When I used one I was using an external antenna tuner. Someone else here might comment on this.
Good luck on your decisions and enjoy the bands!
73