27'' iMac i7 w/ Mini-Displayport =connection nightmare !...

Hi guys

this IS a long post , please accept my apologies & bear w/ me...
when i got my 1st Intel iMac ( white, 17''.. ) i built a desk to stash away cabling & peripherals out of sight yet highly accessible/practical, i learned this pays off when i played in a band & ''managed'' the rehearsal room's/instrument's cabling !
recently i sold my alu 20'' iMac & got a 27'' iMac i7 + Ergotron MX wall mount & wasn't too happy because the Mini-Displayport ( mDP.. ) to HDMI adapter for my plasma TV hang sloppily at the bottom of it but....O.K, i guess i could live w/ that !
later, some extra $ came my way & i got a Wacom Cintiq 21UX + Ergotron LX desk arm. that's when all **** broke loose :

the Cintiq has a DVI-I plug, the iMac's mDP to DVI adapters are plain DVI so an extra adapter cable w/ further 2 very boxy/nasty plugs had to be added.
worse, the iMac only having 1 mDP in/out port means i can't have BOTH the TV AND the Cintiq connected, hence more cables + adapters hanging under the once slick & gorgeous iMac/Ergotron combo.....NOT nice ! since the HDMI cable is 15mm & the Cintiq is another 15mm, the bundle coming off the iMac is thick & makes moving the Ergotron around awkward ?.
no problem i thought, time to buy a mDP extension/splitter ! this would :

1 - spare it a daily plug/unplug routine thus preserving the iMacs port's health - mDP don't strike me as the sturdiest of plugs + the price repairing it if it went wrong - ouch !?
2 - given the difference in diameter of the cables i have & the one of a mDP, moving the arm around would become A LOT easier?
3 - would place the adapter plugs - by now there are 5, each 1 prettier than the next.. - out of sight w/ the other cabling

considering Apple's, & quality accessory makers catering for this kind of machine, extensive industrial design experience, this can't be BUT straightforward right ??..well much to my dismay, no, NOT REALLY !

1st frustration :
after EXTENSIVE web search there are a few extensions out there but i only found one splitter cable - Tripp Lite's P584-001-M2M : http://www.tripplite.com/en/products/model.cfm?txtModelID=4747
however when asked if it would allow to have BOTH my TV & my tablet connected ( but to use 1 at a time..) their answer was :
''....Since the P584-001-M2M is designed for use with devices that will connect direct to the unit via Displayport connection, we cannot guarantee compatibility when using the DVI to Displayport adaptors mentioned in the inquiry...''
in short : it sounds like they don't know & they are NOT alone - so far NO ONE has been able to shed some light on this !!??

2nd frustration :
said splitter is some 20 cm long & the splitter box is as big as a Vicks Vaporub jar : that + the 5 or 6 adapters will look REAL nice & polished hanging from the iMac, right ?

3rd frustration :
the only other way to go ( subject to confirmation it does work.. ) is either this way -
http://www.atlona.com/ATLONA-1x2-MINI-DISPLAYPORT-SPLITTER.html at a cost of