Common:
* Research
* Approach
* Reach
* Catch
* Stretch
* Branch
* Lunch
* Match
* Witch
* Rich
* Batch
* Coach
* Bench
* Peach
* Beach
Less Common:
* Breach
* Couch
* Poach
* Crouch
* Vouch
* Slitch (archaic - to cut, slit)
* Hitch
* Stitch
* Switch
* Clutch
* French
* Lunch
* Lynch
* Wrench
* Ditch
* Fetch
* Patch
More Obscure:
* Snatch (a sudden grab)
* Slitch (archaic - to cut, slit)
* Snitch (inform on someone)
* Flitch (a side of bacon)
* Hitch (a sudden jerk)
* Hunch (a feeling or guess)
* Bretch (archaic - to break)
* Hauch (a small quantity)
* Smutch (a dirty mark)
* Skritch (a scratching sound)
Bonus:
* Bloch (a type of dance)
* Bach (a famous composer)
* Povich (a type of fish)
Remember, the "impressiveness" of a word depends on the context and the audience!