I gotta say, one of the best beginner upgrades is a repeating audible timer - I found it life changing. Beseler and Omega made them and they show up on eBay quite often.
They have footswitch jacks, and this is huge for dodging and burning - no more leaning over to the timer, you can have your hands ready. The switches are more rare and pricey. Just get a 1/4" musical instrument jack (like what's on a guitar, a mono 2 conductor, also knows as TS - TRS is stereo) and a musician's momentary footswitch at any music store or Amazon. Less than $20 for both. Find a place to install the jack on the timer, and solder the 2 conductors from the old switch port to the guitar jack (polarity doesn't matter). The Beseler has 2 wires, the omega 3 - one is a ground, it's green, just ignore it.
It's just a killer upgrade, especially for the money involved (the timers can be found for $25 - $30).