Hello Glen,
Many speak highly of 8300 based cameras, excellent Mpxls/$ just be aware that 1.25" filters have be kept close to the sensor to avoid vignetting.
I feel your pain in being limited by budget, not many cameras to chose from down this end of the market.
If you're chasing DSOs perhaps a high quantum efficiency is a priority? The 428ex has an impressive 76% QE over the 8300s 56%...in either case though it's save more money, sell your body or buy secondhand.
Justin
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