I agree with WIK's comments.
Also, Before you buy, You might want to seriously consider getting a DUAL band radio, Like the Yaesu FT7900, Or even better the Yaesu 8800 that is actually two radios in one box, That can cross band repeat. (Such a radio also works great as a public safety "scanner" all in one.)
It is very important to use good low loss coax at VHF, And as WIK mentioned, TIMES LMR 400 is the coax of choice. Do keep the coax length as short as possible, Just long enough to reach your antenna, That is mounted as high as possible.
I agree that the M2 antennas are some of the very best available.http://www.m2inc.com/index2.html
If money is a problem, You might consider "homebrewing" a directional antenna, The time tested "Quagi" is a very simple easy to build antenna that works every time, At a very low cost:http://commfaculty.fullerton.edu/woverbeck/quagi.htm
For the vertical omni antenna, You could also check out Comet and Diamond for dual band antennas (Do be careful you dont "limit" yourself to only two meters. There is lots more up on UHF than many folks think)
My recent experience with some of the "Offbrand" or clone cheapo dual band VHF/UHF antennas has not been the best. Back to the old "you get what you pay for"
The Astron power supply is the brand all others are measured by. But you might consider simply using a battery instead. Myself and many others run the entire hamshack from a single marine type deep cycle battery (About 50 bucks) Along with a 10 amp fully automatic type battery charger (about 40 bucks) Works great, Eliminates surges, brown outs, And in the event of a commercial power failure, Your radio is ALREADY on battery power!