Two things is there a problem with space and what's your budget, previously ran the Sanwa ERG WRX which is ultra fast but £110.00. When I got tight for space with my Tamiya TB Evo 5 I switched to a Futaba 9550 low profile servo - £80.00 or thereabouts.
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Losi Eight T - Nova Rossi P21-7T- Hitec 5955's & Spektrum + TeknoRC Losi 8ET - Neu 1515-1Y - MGM 16025 & Hitec 5995's.
RC Heli's - Align T Rex 600 Nitro Sport - X-Cell Spectra G gasser.