Haven't kept Mantids before, because of the food issue.
even the biggest ones eat small insects like crickets, flies and the like.
keeping and/or breeding their foodsource can quickly lead to getting a plague of bugs on your hands.....as I found out when still living with my parents and keeping small lizards at the time.
They look fab, though. Been on a huge insect-auction 2 weeks ago, and they had plenty Praying Mantis species, including the ones who look like a legged orchid
There's lots of dedicated people
breeding those, over here; the insect/inverts-hobby is definitely taking a big flight in the Netherlands!
I got a fair collection of bugs myself; all live at school.
recently I scaled it down, but still got
2 tarantuala's (yup, very lazy critters

): a Mexican Redknee (Brachypelma smithi) and a Chilean Red (Grammostola rosea)
4 species of Roaches: Peppered Roach (Achrimandrita tesselata), Hisser (Gromphadorhina portentosa), Dwarfhisser (Ellipthorhina chopardi) and Giant Roaches (Blaberus giganteus)
2 species of Phasmids: Giant Spiny Stickinsect (Eurycantha calcerata) and Vietnamese Spiny Stickinsect (Neohirasea maerens)
breeding group of Giant African Snails (Achatina fulica)
4 big Giant Millipedes (Achispirostreptus gigas)
a pair of Aussi Redclaw Lobsters who breed on occasion (Cherax quadricarinatus)
and a leftover of beetles (Pachnoda)
wich is a bit much, I admit (I have at least as many bug-cages at school as fishtanks at home

)
I kinda like roaches the best. they're active, busy, peaceful, very easy to keep (they feed on the table-leftovers hence cost you zip on food) and most are hardy. unfortunately there's this massive bigotry thing when starting with roaches.......most people think they're dirty, creepy and no good at all.
once seen a roach cleaning itself (exactly like a cat does, and at least as thorough), and you'll see that in fact they're very clean. and if you don't live like a bum (do they have those reality TV shows in the US about people living in their own collected garbage?), they're harmless.
Next to roaches, I'd say beetles! tropical Rhinoceros-, Fruit- or Stagbeetles are truly stunning, and a lot of species are not hard to keep or breed. these too are easy with food (fruit-parts and honey mixed with water; larvae eat fruit, greens and soil with rotten leaves: compost!), easy to breed and very colorful.
Until recently I bred:
after summerholiday I plan to set up a breeding colony of:
