love my 857d, GREAT rig, don't be afraid of a used 857 or 857d (only difference is the 'd' has 60m pre programmed and the non d does not)
I run mine mobile and a the QTH, I have worked he world on 20m mobile (I am a general)
as a Tech you will find the 857 to be awesome, while you might get pissed wih the 450d as you will not get to enjoy it as much
budget
857d $500-900 (depends if it's new or used)
2m 440 edison fong J pole (build it yourself) $2-5
10m and 6m just get a couple pieces of wire, about 8.5 foot long, then attach then to another 2 pieces about 50-55 inches long... now you have a 10m/6m fan dipole (you can add as many bands as you want, but more than 4 or 5 gets a little hairy to tune)
other things, might want to look into a 2m halo and a 70cm halo to work those band
also consider a tuner in the budget, maybe a 949mfj? $50-$100 used
