Jeff,
Since both the uBitx and Bitx40 kits come with a BNC, that's what you should specify.
Anyone who absolutely has to have a UHF connector can easily and quickly enlarge the RF connector opening with a $10 set of Harbor Freight step-drill bits.
Step-drill bits work great for chassis work, as they can be held in the hand and don't require a drill when used on thin aluminum or plastic.
Working slowly and carefully will prevent oblong holes or tear-outs as is common with other types of common bits.
As for a speaker, a common 2"-3" diameter, 2 Watt, 8 ohm speaker from ebay should be more than adequate in a small rig like this. The TDA2822 Audio Amplifier's max power dissipation is 1.4W.
Farhan appears to be using one of that size in his prototype video, and the audio amp seems to handle the load adequately.
Whatever one you chose be sure to specify the proper mounting holes and hardware.
Another point to keep in mind is that the kit includes 8 ea. 0.5" long standoffs for mounting the PCB and the LCD display. Don't forget to specify the mounting hole size and locations.
For me, the simple satisfaction of building by hand and having a professional looking result to show for it is more important than all the bells and whistles or bragging rights of having the latest new rig.
Good Luck and Best Wishes,
Tom N8TPN
