Really like your Idea!!
Toyota MR2, Mazda Miata, and Fiat Barchetta
Also there could be a nice addition in the low output segment the suzuki capuccino (
http://en.wikipedia.org/wiki/Suzuki_Cappuccino) kind of car.
A FR rotary turbo engine lightweigh car with 50/50 percent weight distribution but not that really powerfull in the 240/280 hp class (Rx7 like)
A MR (Midengine) V6 3.2 L NA in that same class. (NSX Like)
A FR Inline 6 NA 2.8/3.2 With almost 50/50 Weight Dist. (M3 Like)
A FR V8 NA 5/5.7 OHV or 4.8 OHC with more like 58/42 Weight Dist
In that same category (It could seem like to much Engine for to little horse but I had a Camaro RS 92 with the 5.0 TBI and only 170HP and I loved the low end grunt the Z28 with 240hp was my first option but i was to shot on the money I regret not saving enought)
An XR GT but with a 2.4 NA Inline four making about 240 hp (968 like)
Hot Hatches 4/4.2 meters long with AWD in standard form and about 200/240 Hp 2L Turbo Inline four With the respective Dirt Track Version the RB4 seems out of place in dirt/gravel/Ice need a much more agresive body like the Delta Integrale Evo/EscortCosworth.
In the Fz50 car segment there is need to have more cars.
And what I really like to see is the next segment from 400 to 450 hp but remaining sporty (no, not new M3 territory here) I mean FZ50 Bi Turbo (Only Rear weel drive please)class here more weight but nothing more than 1500Kg, a Highly tuned OHV 6.0 V8 FR (Like the Vette) with good Weight Dist. Torque monster, V12 MR 5.0 in an sleek car like the diablo and a FR V12 3/4L Like the old ferraris.
Thanks for your time.