This pack was designed to be playable on all computers (even older ones). It contains a good basic set of the essential tech mods with some fun stuff thrown in like hats, morph, as well as carpenters blocks and chisel to add design options.

Modlist:

Waila (by ProfMobius)
JourneyMap (by techbrew)
CodeChickenCore (by chicken_bones)
NotEnoughItems (by chicken_bones)
Inventory Tweaks (by Kobata)
BiblioCraft (by JDSinclair)
CoFH Core (by TeamCoFH)
Thermal Foundation (by TeamCoFH)
Thermal Expansion (by TeamCoFH)
Applied Energistics 2 (by AlgorithmX2)
Extra Utilities (by RWTema)
Waila Harvestability (by squeek502)
Carpenter's Blocks (by Syntaxial)
Thermal Dynamics (by TeamCoFH)
Storage Drawers (by jaquadro)
Iron Chests (by progwml6)
OpenModsLib (by OpenMods)
OpenBlocks (by OpenMods)
EnderCore (by tterrag1098)
Ender IO (by CrazyPants_MC)
Redstone Arsenal (by TeamCoFH)
Dense Ores (by RWTema)
Steve's Workshop (by Vswe)
Buildcraft (by CovertJaguar)
MrTJPCore (by Mr_TJP)
Forge Multi Part (by chicken_bones)
Project Red - Base (by Mr_TJP)
Project Red - Integration (by Mr_TJP)
Project Red - Compat (by Mr_TJP)
iChunUtil (by iChun)
Hats (by iChun)
Baubles (by azanor)
Morpheus (by quetzi)
McJtyLib (by McJty)
RFTools (by McJty)
Wawla - What Are We Looking At (by darkh4x)
FastLeafDecay (by Olafskii)
Steve's Factory Manager (by Vswe)
Morph (by iChun)
Buildcraft Compat (by buildcraftchildsplay)
Chisel (by tterrag1098)
Storage Drawers: Misc Pack (by jaquadro)
ExtrabiomesXL (by Annysia)
Iron Backpacks (by gr8pefish)
Calculator (by Ollie_Lansdell)
Baublelicious (by UnwrittenFun)
BiblioCraft: BiblioWoods ExtraBiomesXL Edition (by JDSinclair)
Iron Tanks (by Indemnity83)

Lyrida's Lite Pack

Applied Energistics 2

Baublelicious

Baubles

BiblioCraft

BiblioCraft: BiblioWoods ExtraBiomesXL Edition

Buildcraft

Buildcraft Compat

Calculator

Carpenter's Blocks

Chisel

CodeChickenCore

CoFH Core

Dense Ores

Ender IO

EnderCore

Extra Utilities

ExtrabiomesXL

Fast Leaf Decay

Forge Multi Part

Hats